Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c01798abe41f89…

MALICIOUS

PDF

87.8 KB Created: 2021-07-02 02:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: aab0a020285016160ba223ee813fe6ab SHA-1: 4ca002648ed3d3d11b2e6d69b1979767cfa821a7 SHA-256: 22c01798abe41f899407453aaf77a51fab4375154ea9e8024d12a4175ab5f5f8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm, suggesting it's designed to redirect users. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://medvor.ru/uplcv?utm_term=temporary+file+cleaner+for+windows+10 PDF link annotation
    • https://alternativecarrepair.com/userfiles/file/11596797391.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/39781ab1e94bfce82f4cb9a7d4feb7a6/dotax.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2f9134f02---98129458281.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/napodesugawape.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075625fe4d19---89555396694.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/xemakozo.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/140f6f97c41babef6185b54be8647d6f/poriwegarabewudug.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609adba6902ec---midirutikefiluzof.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/beda4b1e05d88ae580783c48b93cc6f0/rawadijowukigifebipapis.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/71965775005.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/4ee298fbafc9a6c6d45c7c39704fe87f/nekurirunekawinefug.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8803ce25d---tipiziwovanejusanokodu.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acdae140a9f---sakefaroripijibakubutag.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096680f3d29d---mofazivesones.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/sewakuzafuvalefemepuko.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a212f9b2efd---10507469610.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/majovokatefaze.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc9ad0ae9---fivaperit.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61278dff9c---jotajefovamusuzikoko.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/fd9b0885b4945a1cd0856bcbdc5662e6/9983218794.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/famavonuvexatenofaxari.pdfIn PDF document text
    • https://arerp.kr/data/file///79610193822.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c3507812ab9---gekurerodipogapaken.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/99632326349.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b7271a46e0cedc83e76359e1c36cab43/17223627988.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e184c42e08---23162038337.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF173 17584 bytes
SHA-256: a1e8f1fa8bec5c6841beb06b21e8d9132b3f17e1adc65e290b7a6f8559c3fb9c
font_01_sfnt_off00011ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFB 11020 bytes
SHA-256: 4a425bc0383bbc228ed19e48b84dc568b9bf9c84a4b29df48e04133466f226cb
font_02_sfnt_off000139a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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