Malicious PDF — malware analysis report

Static analysis result for SHA-256 00ae818ef4cf2325…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 15:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c7993f5dd4d21dfb340776086d1c87ed SHA-1: d1f6ed6f64d0ae91728e3369cf9ed363954bb0b0 SHA-256: 00ae818ef4cf232580fc7bf7cf880f909ee5ac0acb3dff2632dce12a8a0a093c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised WordPress sites, likely serving as a lure for users to download a password-protected archive. This tactic is commonly used to evade security scanning by encrypting the payload. The presence of multiple external URIs and the compromised CMS upload link heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=how+to+export+my+text+messages+from+android PDF link annotation
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1f8c2e2c7c95f656b6035568f0774f73/22544274417.pdfIn PDF document text
    • https://theurbanthinktank.com/files/28633538141.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365b31f3457---32669497051.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/95479647252.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210913002050.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/magimegajigusoka.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/30316249514.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/vokovururarajamedagugof.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613af6a7ce199---toponamufemawibojuxevupol.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/kuvaxepoxakosuxapup.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/pijexozekabedobaviji.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/wurukasowiv.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/rekepovezulagowaketi.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/pevatusirafufukevolag.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/43377306147.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/47239514884.pdfIn PDF document text
    • http://arucax.am/user_images/file/nusowizazobodaravazip.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/85931802367.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/wadorepit.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/44358389589.pdfIn PDF document text
    • https://interconformity.ro/images/file/68405261224.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/rifunu.pdfIn PDF document text
    • http://annabarons.lv/files/files/repepipuwalufuredubi.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/naronugojojotalaxij.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_off0000dc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF483 17936 bytes
SHA-256: 4011da7ae545f548b9fe52e71710c272481bd0297612984eeeeaf3703908dc75
font_02_sfnt_off00012268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12268 11088 bytes
SHA-256: 84592ba35d74f751ddff2c6c624062c227ca1d3faa40af2c9d24275d48a06c06

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