Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e80ae60dc728406…

MALICIOUS

PDF

88.8 KB Created: 2021-08-09 06:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 565eb3fb394fb25ecd091c8e94b23249 SHA-1: aec5649fa11dc65ae2bd3223244e8f8445e417b0 SHA-256: 6e80ae60dc7284064edf61fc7a7c97c4b257eee1fa9590efbc32aa3a5f0fe260
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external sites, many of which are hosted on compromised WordPress installations, suggesting a link farm designed to distribute malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document likely uses a fake invoice or payment theme to entice users. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://oniceh.ru/uplcv?utm_term=cidco+lease+agreement+format PDF link annotation
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc5747d938---79783752676.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/1731646150.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/84304321649.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16254335843911.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/zilunabatono.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a52ec7e0ac---41900406984.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/35545203844.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/fv3jq58dj3upm91auttg1l14lg/66145337774.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/zogiwiwutazu.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/13256580807.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7fa2395ba---polalotikomefonibabur.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/8g8ebe8rrk1m4aflm9qd7tm8m1/77361310520.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/31717488323.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608926431bfd6---53672873804.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607437a5ede23---23465357637.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xogara.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/59175222934.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/70168d4b78f8e2438a12b19146e86fc2/pigurobijogugo.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2e7b68208---vamemodob.pdfIn PDF document text
    • http://maygiaphat.com/upload/files/86831821345.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_off0000f863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001107a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107A 10848 bytes
SHA-256: 0c38376158f35ebafd34e15c0524781097ab4de44c02f44adaaca62d805e3b07
font_02_sfnt_off0001294c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294C 16800 bytes
SHA-256: e35583dc2021305ba5839dadc3228f820e3f8ab28cec5f5dc872dcf034a1dd0e

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