Malicious PDF — malware analysis report

Static analysis result for SHA-256 75be1a1966424bc7…

MALICIOUS

PDF

71.3 KB Created: 2021-09-22 10:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e38647741b528998bf64820ad92e256 SHA-1: 84cf6887854d80e27affa5f3b91cd5233a3b9687 SHA-256: 75be1a1966424bc72f44bd1b876f2cd92e92b958d59f51b81b779973c6e77d0f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of multiple URLs pointing to potentially compromised or disposable hosting, combined with the 'SE_CALLBACK_LURE' heuristic, strongly suggests a phishing attempt. No scripts were extracted, limiting the analysis of specific execution chains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://sergeybazarov.ru/file/80672776446.pdf In PDF document text
    • https://weishinclinic.com/uploads/files/202109061245086785.pdfIn PDF document text
    • http://symbolfoods.com/files/file///39023467368.pdfIn PDF document text
    • http://vejwun.cz/images/24201555333.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/rodizunuvukukesamubowubok.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad25578263---fesov.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/38530097301.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/91979873108.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614549a4f3359---titileloxavik.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/59581462342.pdfIn PDF document text
    • http://www.77ice.com/upload/files/vuguselerojul.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/decaeeea6eb21d281757ebf1d712c65a/4861280033.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/kuleg.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/51902773933.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a0f5f2154790494afb2355a4e9c30292/19556949894.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7029f6999d2ad999484ebe3ad55461bf/vubelixuk.pdfIn PDF document text
    • https://trystsalonri.com/images/file/34127356644.pdfIn PDF document text
    • https://longhoang.vn/upload/files/70679430442.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/fanetasudotu.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/sirepux.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa0ea2f3e1---21331392023.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/fewasuxofowekovo.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/81994174359.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/9825dde964496b94c1ae7ce6ac718bec/45773639685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=is+it+safe+to+charge+ps4+controller+with+phone+chargerPDF 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_off0000b84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84D 14912 bytes
SHA-256: 22cc84e5711d3222db587bea5f63e4c55c706050c4e6634a52fa3fca00af19ae
font_01_sfnt_off0000dde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF600 10872 bytes
SHA-256: 2fa7ce6fb6158e3bccb11ae0dfa9579ee8a63adef3e78ac46208a9f684f03ae0

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