Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d32681a7a3beef…

MALICIOUS

PDF

69.8 KB Created: 2021-10-03 04:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a79d89c252b8253a39246b0be4d22cae SHA-1: dd70352dd75e0664d4ca36a628f424888ddf2cb1 SHA-256: a6d32681a7a3beeff0ead91388bcc3a0cae347bfdaae5b992ba611b55f4a3214
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting, likely to obscure the true destination. The 'SE_CALLBACK_LURE' heuristic suggests the document's content is designed to trick the user into calling a phone number, a common tactic in tech-support scams and callback phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://medvor.ru/uplcv?utm_term=what+a+beauty+name+it+is+lyrics PDF link annotation
    • https://hongmao.tw/uploads/files/202109011102057892.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/20789938658.pdfIn PDF document text
    • http://telefoonindex.nl/images/uploads/36889151828.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615227bf04356---36763048190.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/wizogosakurovut.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/fevalemusili.pdfIn PDF document text
    • https://termoformat.md/img/files/wojuke.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615196b13ef72---16468388345.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/71111846690.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613482fb9b0b3---pujibafovukafaz.pdfIn PDF document text
    • http://muszempilla.com/files/file/26509072704.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/xakexipes.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/91481118959.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/18736277329.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/sokokatimajuxaloto.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/26229930406.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/62219641983.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/8903783917.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/sm0om0ghs7e3n554680cqq88tu/wuwopadowolitez.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/17456479981.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/gupatojatozor.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c99eaf817---18550141658.pdfIn PDF document text
    • https://tekmaker.com/upload/files/lozumajadomatatotixufimo.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_off0000b154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB154 10720 bytes
SHA-256: 0f2ae07a753394b054d79a803b44c2847e871f92c7ccb54169287b716417aeeb
font_01_sfnt_off0000c9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C4 15024 bytes
SHA-256: a693540b4481c3f24740c8faf942fd2c843eb38543650df9ef7c0bdbeb8c3706
font_02_sfnt_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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