Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ad06efe4338d71…

MALICIOUS

PDF

88.4 KB Created: 2021-08-12 21:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: fc612dc4b55ea254634f581a4cde80a7 SHA-1: 586ff6e9193673ba1c7300e9edfe57cf6fd681b0 SHA-256: f5ad06efe4338d71448e60d9d8bad1229e24ce714cbbcf95a05d4c4216a2192f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these URLs and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://krisoc.ru/uplcv?utm_term=butterball+boneless+turkey+roast+cooking+time PDF link annotation
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b918154d82b8e2390777178524d59376/ginodegawegerowo.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/96411695697.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/zunarikafodu.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/84740950459.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/42605715407.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/6r32valebtcuh803qsqh7mso0n/27398802049.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/xawegodebuzutebudeses.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/5e16c2ea25cefec9abed5347ae2c5a18/favuwoxomeviketuzebajiwa.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f0d2f8a7291---12243154881.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/romojujetodefabubutekomo.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/aodlkpvnuppkdfvqan3k8omdek/faxurizuxutigiladedoku.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/38819556563.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c2491c99b---pogaxenunobapodoveso.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/zetomimevuxumobubo.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/94602657891.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acee30d81a2---dejezagubapesirizi.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/97ba8f0e0a7d134a8b57751aa451e995/zagevanuleporaj.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/7126069474.pdfIn PDF document text
    • http://ezstreetautosales.com/clients/876244/File/ganaxukuvu.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/eb0c0ef7925746e9dd566981c451607e/miwifud.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e209b2e3d---kifofavoduxujedumid.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_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 17552 bytes
SHA-256: aa031d8340e7af3aa79c7098f6aadefc356d0c37cde016c52177a70ebf8062f0
font_01_sfnt_off00012107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12107 11072 bytes
SHA-256: 933fb3af2dc269b09ff80fffe78d668c4d053b05dbe5641f176dee77462d384b
font_02_sfnt_off00013aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1