Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9e3e32cc599e32…

MALICIOUS

PDF

81.7 KB Created: 2021-06-18 01:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7fa33870366fa965b62623d2abf93be0 SHA-1: d76d3022e4e7af974b32d3a5762a67a3d2ef5e3b SHA-256: 4b9e3e32cc599e322b93126cf4c861e5a700e46d7799555d6219ae63d46f459a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for credential harvesting or further malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wastran.ru/uplcv?utm_term=free+coordinate+graphing+mystery+picture+worksheets+pdf PDF link annotation
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9355b37f15af6b921f1f0b27c6cb6b6c/77611801483.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/g0akmcfgv1dptrlha2nd1e7vl6/fijuripisefadawupimef.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160849f0ab3d6d---12702013598.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/pajad.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/9i6ed75amipfs1t8em7jg6jck2/34631420601.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/814414ca2070f57a236b675d5e544853/54929101433.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f172a1800d---fadunebo.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/mesonugarukerewamelus.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c47a9c1ab71---46074474260.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/uae176eamq9t4oetspdav3ukap/kuvurivuxovewegabusisexe.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/luraladafukaporuvazurisa.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a86c3624397786f4d9b2ae258dffa2db/jasote.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607208a4a66b0---pokatamawuzomijopifeg.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082786149fab---62547773376.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/taxate.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001002a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002A 5748 bytes
SHA-256: eb5eea8a6a5c1736a0e1a59f0a95b335f3752314f02c3e9f68163a3ec1ae3d3d
font_01_sfnt_off000113b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B4 11120 bytes
SHA-256: f1aa32debbe4cdc52d9157c54772f925a8eb33d38637216a02adaa221824cdc7