Malicious PDF — malware analysis report

Static analysis result for SHA-256 81eea8b126c2e3ef…

MALICIOUS

PDF

96.5 KB Created: 2021-07-30 02:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 78c32fdf1f702efd270f9ebf34792c8d SHA-1: 9780edbceec58cbdb07d327a300f2247d0dd08d7 SHA-256: 81eea8b126c2e3efeb1aaf62550aa03d3062bece5dafef08a1de3cd77ec449f5
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file exhibits multiple high-risk heuristics, including a link to a suspicious URL and a lure to disable security software. The presence of a download button and instructions for a password-protected archive suggest an attempt to trick the user into downloading and opening a malicious payload. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9857

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pixomot.ru/uplcv?utm_term=the+binding+of+isaac+afterbirth+plus+pc+descargar PDF link annotation
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/203e5a36aa845bff20911c0d5c2db0da/75325921820.pdfIn PDF document text
    • https://egca.fr/userfiles/file/35641049512.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/71651936467.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/af76d094a7327cdabac92c28709b3a91/24231746740.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5323d68d6e---94090422466.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dff89539dd---11100159341.pdfIn PDF document text
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/7014450049.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c14b0aee194---marofejewiwenutatodasebe.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ct1veqm397t0sdus4hc1ls5u00/voxakepeterekekomevufezo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/1u6a7hpdrcdss1me1v05381qh2/mojigaguvabesepaniwatuzu.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/e7b6658d9e04595eeab1824a3d139222/telopogifupaxowomozig.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/53186944711.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7607bf8f9---wosazixijoxoperuxi.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/fobadadogegarila.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b273cbc10db---fefunom.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/647baf8ea3b7baccb779a3169c7295c5/77818594664.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/46244577841.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/13010750179.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2d90b507f84e4515817c287cb08ca1ed/rovurovi.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/3648797917.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ba2d567a0---pakipozavowavive.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/osqg77v1lc1ghq1tu8pir7d0m3/10273626277.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5c167ba2ac197846c5afc228168afe87/28119359682.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 19164 bytes
SHA-256: fff3cd8c352afebdb0a4c7c8b2e229344bc3b76ef97f1d1e7c3e530be438b20d
font_01_sfnt_off000121d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D1 1716 bytes
SHA-256: cc553d1529383b269bb24314fad5b651d3bff4c995ccf32223ccbf8b66ec55e0
font_02_sfnt_off000129fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FA 11104 bytes
SHA-256: bc0e923ab68516585490ccbd09615eef8f1409023d2d7397dc163204073b30c5
font_03_sfnt_off0001435a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1435A 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
font_04_sfnt_off00015982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15982 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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