Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec767af02d62bfd2…

MALICIOUS

PDF

72.2 KB Created: 2021-10-02 10:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3058368f8d01a8536a9e3746d581adfa SHA-1: 0c28efbfbff413a8868d1616d978b2134449bdbb SHA-256: ec767af02d62bfd2b667aa330cc60eb4bbfee99adc0a32283e796209a09ac64d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for phishing or scam lures. The 'SE_CALLBACK_LURE' heuristic further suggests the document is designed to trick users into calling a number in a billing or security context. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards malicious intent, likely related to phishing or a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=systolic+pressure+meaning PDF link annotation
    • https://umutfm.com/resimler/files/83025054892.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/554353012.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/3653200937.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/57992629187.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/12505346650.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/buwelitozif.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/jgon6thcsi0uilqmetah636m73/97602344389.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/40213549047.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/90269943580.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/e5ade7a7e0223cd3274a8d5487e03e9e/32007713011.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131bcea0ea98---32933492569.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141c8c2ebda8---43555887177.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/2282620696.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/piwubedorixezeximugudeles.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/26855181551.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/mudabuselogizamedipo.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/wubofaxozowejovijazupe.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/tavora.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/13232438971.pdfIn PDF document text
    • http://oilspecchem.com/files/wokogosufepuluromefu.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/76438376507.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/wotazabulotijuwatu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152cb82f18a9---zavelovojiwener.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_off0000b349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB349 17636 bytes
SHA-256: 891864b2ac497af6136b74d6bfa144644cd21884f7df46fccea652312f228a31
font_01_sfnt_off0000e063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 11008 bytes
SHA-256: 088dcdf486ad2f97ee49625bdbf9103ebc63566bbc32f10fd041a7d0b7880bdb

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