Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c83e2c6dcaca333…

MALICIOUS

PDF

77.3 KB Created: 2021-06-15 22:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8476ded6c76fd52bb51d41bc56baea7a SHA-1: 627aaadddf712e6fad4a9a82badeafe020afef40 SHA-256: 8c83e2c6dcaca33326b232258a42803820be16b742606e624fb4b380371e25bb
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 sites, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely leading users to malicious sites.

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://crysiq.ru/uplcv?utm_term=endnote+x8+user+guide PDF link annotation
    • https://atraba-holding.com/userfiles/file/tubakidi.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/4efc11cf3cbd367171c62c8b9c087813/42192830615.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/56b92128e7eca5b10144f891b99de47b/ferax.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/f5aac6d300b378f582e2c53ab50ae74b/ketatomagubisatonolakejov.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/47308445741.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/725251f81710fec0b74d8023031d0a84/vilujegigodenobep.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ef26d8b465a7e54529334bec3f3e855/wezafukiribatipadonigorat.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/xefaxuz.pdfIn PDF document text
    • http://sport-way.ru/img/file/57278742659.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/9a4eaafabf5ac5107bf0267df1b6f2bf/34468044173.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/fuditalaxamo.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/0dffc8b7ef3835aff53900e813e4859a/5083972511.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/4vef9234gcb42jmsrkgmo9332t/30294461740.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/4740128197.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607755eaa6dcf---bowugaf.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608590a7591dc---jemun.pdfIn PDF document text
    • http://www.opentle.orgIn 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000dcba.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDCBA 14048 bytes
SHA-256: 4d328bc2a3ec727ed2f719a8603317aad921c1eb7336d1c9ad2b058931c613a4
font_00_sfnt_off0000cbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC7 4972 bytes
SHA-256: 2ea87aca24cfbee687d54084a8b25b774a04d82029be6207b94c7ff54f07830e
font_02_sfnt_off0001040c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040C 9764 bytes
SHA-256: b8c2d05c19224163cce55e2d31511a636b71b7cb63ebe9ea570110e51ee74d03