Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b14621bbd29c921…

MALICIOUS

PDF

93.9 KB Created: 2021-09-03 17:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 89dc3a27357e2e61727e78b20e05f1bd SHA-1: cf964c1204864cfce886e731450d6cdeb4ece1f6 SHA-256: 3b14621bbd29c921dad90316e2f295f3c9f2b9818db21e03c1b1f04b10b5bc9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically highlights the use of compromised WordPress upload storage, a common tactic for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://vicotelecom.vn/static/source/images/file/gafanumita.pdf In PDF document text
    • https://kalashad.com/userfiles/file/66023085287.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/zegexomafodojetegimo.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/dejonitameluxowi.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087f18ce0e58---62238391286.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/b0442b490797aa871fd561b2e05bf148/dizuzevusobitexogofizo.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210611041846108.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c25c2610b---46390272239.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/ea6a9f7da2fdb082fdb7d5671217dfea/81395108545.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/lisomulomatogubumuk.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/g5n97918sugnvgral1tpbogp7q/17850024176.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/58177573738.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161185a400667d---gesun.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/2d0e1f2e45560907127e4cc582e34344/juvufepemako.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9a28568bbc000723ac860619c5e7b0ab/pamobot.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/jumajalokuleruvesevosag.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/sexezodi.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/jewew.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/78460322048.pdfIn PDF document text
    • http://trovas.com/userimages/1504711032.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/dce1c5615dd8daf22b5a21e938165d1b/tuwurajeguxazitakenixuk.pdfIn PDF document text
    • http://xn--42c1dhzaq5aeb.com/userfiles/files/kelogipeladek.pdfIn PDF document text
    • http://e-hematologica.com/users//file/dusaxofizuvemisuxuwavamu.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1621367607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=majorana+fermions+pdfPDF 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_off0001072a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F41 10636 bytes
SHA-256: b14367c1dd5c73fd0db6742b3620bf002a28173281596aee29fbe8537ecd6a0f
font_02_sfnt_off0001377e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377E 19164 bytes
SHA-256: c497a7876d67c0ea3bd79d05a096eff64a236158bba711dc1444a9d534afd27e

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