Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f017b6aa6c38b8…

MALICIOUS

PDF

98.1 KB Created: 2021-09-05 13:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f97d97f5fa665578fd98a0c4334a580d SHA-1: d43c9f82d26bca4a52df0107aab60cd5205a4881 SHA-256: 91f017b6aa6c38b8311f8693181e803a5b5cdefad54e0f021229eaac0bf5a798
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and the overall structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608247a108923---30419455179.pdf In PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdd988c08a---92894642263.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/pukawijenoladakikas.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/cad24c8e9008d7311b83e0ae5d3b2b75/gevobeg.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/37171050976.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/repujawepobapogif.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/wawuwasimifezokabubanolor.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/wadixakekovotixumi.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/74274868583.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/79670227601.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/24059892720.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/hj4pb6v5rpk314s9jj4feqnoa7/mupasiripezaxa.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/82879385969.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104a4386f3a9---dajojapotefokumemukorade.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7d8db550cdaf0b6da1e168eaa5570aa1/jufexepopabuxuxidexifatar.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/156m3kof18bhlbgposm66a3m9k/98389838061.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cdd4256c8---64527219793.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/roparago.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/f4b713952b27a584366118756a5632b9/77456088889.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/951e6e3470d68159c37aaa81ed1bbb0f/24191574604.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a27cf3cd4f0---vapeletepit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=capitalize+earth+chicago+manual+of+stylePDF 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_off0001167c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E93 11232 bytes
SHA-256: 065d37b0b144ab027337167346d2d02c543cbbfaad2647e95544e96da2637fd3
font_02_sfnt_off000148d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D3 19200 bytes
SHA-256: 289b3499b38661d072d871f645fb1668d3e368f3b0bc11b1aac763dc7ed553d6

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