Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaea58a578d3731e…

MALICIOUS

PDF

79.4 KB Created: 2021-07-19 07:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1cebe155670764ecfdf1cf2fe64dfd16 SHA-1: ded6c9feffd43e2d80da60cf3f9c2d2d0b3d9bb7 SHA-256: aaea58a578d3731e89a861f7b2ef3b135479b113f2e9c332c4de2de758d08373
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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 http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5f22da28c---13480669257.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/cb4fc0673273df3393b308a92402d57f/kivenarejorebatozuvas.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a32d17208e---83205143020.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081d8569fc54---kikukelixiturijaravega.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/c66282eb5d7eaca8aad5524b2c835615/zetozifebinuvaduteluriw.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085ed74d15c2---39460581043.pdf
    • http://ajtoablakcentrum.com/_user/file/54608119907.pdf
    • https://calmoinc.com/upload/editor/file/20610056689.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/d1e1aa545469f9aa80fd263f8e342ac5/mibadijuxilisivuzeligulo.pdf
    • http://iphysiology.ru/upload/61150013977.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16082db1fa167f---latino.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921ed737c62---jetefowitode.pdf
    • http://bannermaul.com/userData/board/file/pamubidusorexetoxan.pdf
    • http://neoneophytou.com/ckfinder/userfiles/files/54483617818.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/ruxixotojimowiji.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/a7a9fe03c8f4ee3c79f67d4928f0a24c/gojuzefasokobekidewegome.pdf
    • http://berbun.com/user_img/file/japapuvafe.pdf
    • http://babywagen24.de/userfiles/file/8291490837.pdf
    • https://addsfly.com/userfiles/file/dawaxuvujofami.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6651a5f535---43306074673.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/78991847221.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/aceduskfhnl2hr0ja9tpmuvqgi/jujobe.pdf
    • http://www.gesas.it/media/mailinglist/file/wogizowemoxak.pdf
    • http://media-production.net/admin/ckfinder/userfiles/files/85300910572.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=law+of+gravity+example
    • 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_off0000d407.bin
80ff4edd57e65e0efef6c6dbec947c39365572660b022169632f31d1a1bd9b90
pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 16748 bytes
font_01_sfnt_off0000ffa4.bin
375c1040dde5cc15b7ceea83d599a437534353f3b6ca39deb6f50b5995e5e475
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA4 10756 bytes
font_02_sfnt_off0001187d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1187D 16792 bytes