Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f70c32752a5ef6…

MALICIOUS

PDF

71.6 KB Created: 2021-09-01 18:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5eab2c7cd3ecbd850a55dcdda66b61d9 SHA-1: daaec9a9733c9616d67d09b3b6a1573d98bdd818 SHA-256: a1f70c32752a5ef66a22845585c7fc931b9ef9138cb7e3a55c0e3d5c91ba82ee
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content or downloads. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the overall structure and heuristic firings strongly indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 71 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/e444878834906dfb9807115cd5c193cd/pafurelab.pdf In PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/48d51a657bb173716fa32fc91f50d580/sixutavisowagarepisux.pdfIn PDF document text
    • https://airbays.com/userfiles/file/tuvivikavuxovinikenilinel.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/sopijoneletesojalidi.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/33451660210.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/xikutoriwo.pdfIn PDF document text
    • https://nyig.com/files/file/99228451954.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/wuxapipigisuwugejas.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3c8318f3f---51045105407.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/bf6a2d9b5afe340ca5fabe4813369e65/kodekuravinuxif.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161207476ece28---jesekogexuvemino.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9222365d7b---37446710844.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b070f0c621c---78732083779.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/98880275826.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/95298462985.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/h3nbmb096ms5nhepm04gp8pg1s/6261357685.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/7898193421.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a73b480e908---senixipolesarabulomedo.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/27d13a6a8ad8069de58b36a9e1bcb9d2/dipajegiduvereseja.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/24700315677.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9e2a01f49b8658682d329429fa1614fd/bonif.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832b61e0992---pavofuvudisefavot.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fcae515f---28595840251.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/wixawuruzevalepol.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/rixutebudejuzoluw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=salmon+and+pearl+couscousPDF 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_off0000bb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AF 14280 bytes
SHA-256: fa0a4b77ed87e85b37d00017cd4c120ecf78db5f27a7be7fd9307bf8ac4790c3
font_02_sfnt_off0000f766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF766 10660 bytes
SHA-256: 53b3306c89259a274bd3932121663ed8bc68d3a8274e189c7d9110c6194ff86a

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