Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b3d71e5cdca50a…

MALICIOUS

PDF

72.3 KB Created: 2021-09-24 14:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0f84f871a7875b9587608073eda0b00d SHA-1: be9c81e79c4315004eae764d341febb87a823ef6 SHA-256: f7b3d71e5cdca50a09e733025b5168a8179c4cbb3476dd9f60ebe9ceec861057
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nigerseedindia.com/uploads/lefiwevuwanaruvujij.pdf In PDF document text
    • http://pvvc.cz/files/bibivodigenebifux.pdfIn PDF document text
    • https://finliz.lt/i/File/jinub.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/pubowobebiximunubupevad.pdfIn PDF document text
    • https://yifff.se/userfiles/file/xafijozarefepem.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://regiefranchet.fr/userfiles/files/66415627396.pdfIn PDF document text
    • https://grouptm2.com/contents/files/83766682078.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/govelikuvid.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/7b6ohqv4vt45g1eclimjjoqf96/betekisonumodejepo.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0dbd18d16643c9914c9911b1340ea13b/xunuduwogofikaguzix.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/afa0ct43djjhv2udvtop3vq6v0/siziropusoxirixudis.pdfIn PDF document text
    • http://houselandia.ru/files/5944102010.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/73112281620.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b19e03340582b422f285fd53f012abf8/dupezewegivubevosaluzakod.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/59156016747.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/dowoponunem.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/90066754448.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/17444436601.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/pusaresabawevoxaliz.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/xososexadod.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/31347141693.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/1081259283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+find+processor+in+android+mobilePDF link annotation
    • 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_off0000b446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB446 10996 bytes
SHA-256: e738afa2473d059f0dde2ea5babbaf99da58e61be7e243c1edd9d1d99cd08d5d
font_01_sfnt_off0000cd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD91 17696 bytes
SHA-256: 49d4d409236ee4b6d8f73a81449c92ecf20d254ee7ff8de586e1ede64ca60208
font_02_sfnt_off0000fb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1