Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e2b706013bcc83…

MALICIOUS

PDF

80.5 KB Created: 2021-07-07 21:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cef6f431a9b133d465ce931a2091fc11 SHA-1: 6740ea179b4829777757782bce86e7a4360e455a SHA-256: 85e2b706013bcc8386a6bca0d36edc7b435600ea878f6c122cec88b9d31204ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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 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://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/ff37c6c734c50f1652706ba1cb4b98bc/67814099676.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6d5a5abf---figeforuvabolotifediwu.pdf
    • http://petraifevronii.ru/ckfinder/userfiles/files/232901195.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac050b81608---kolebikolafefubaruxawuk.pdf
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/jevifezofobufil.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a7806889b35---42359571841.pdf
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/31224843110.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e98699a43---46137341509.pdf
    • http://jjmcp.jp/userfiles/Image/file/luzupusixe.pdf
    • https://habibitours.org/ckfinder/userfiles/files/nitaxobitum.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821e259f8c5---nikoriwitubofivotomerebib.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d9bd901c9---xufubirigazusogere.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607779b6e2ea4---3508247227.pdf
    • http://obrienbuilders.com/userfiles/file/vuwefonoguruvoj.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/b7dc2e5e0ccd59de30bf6b39fdfe12c0/redusezugetorurutop.pdf
    • http://boekenwinkelindex.nl/images/uploads/45263727757.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/d0be6e0ad236bcf7313965ee28edc0a1/92758300442.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/84154fa114420d7655d9fd09edad6b21/tokixaredegatovox.pdf
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/86569815884.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/b17399a08232b1fff0898d62ccfa14b7/wofevabetiluf.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/mokonirawokewakakob.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bc171b27e---dipetuz.pdf
    • https://maturana.cl/upload/file/wugifefunusepaz.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16074256057077---rirewinaj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=institutional+ownership+data
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d663.bin
6226bd8e2347afe81edaa529f8a9be5a1a44c862b673362ffac7d3b0b785cf17
pdf-font-stream PDF embedded font (sfnt) at offset 0xD663 10624 bytes
font_01_sfnt_off0000eeaf.bin
9250d0d912cc1b31b5ac309e181587ab1239f3928f1fba5458c6520cc539ad49
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 17116 bytes
font_02_sfnt_off00011bbf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBF 16792 bytes