Malicious PDF — malware analysis report

Static analysis result for SHA-256 0967fd1c6479c32b…

MALICIOUS

PDF

95.8 KB Created: 2021-09-16 23:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6efe45da65110d22ece389b99918425e SHA-1: d58a3d495d107b18b77d24f5f223554bfe4fd2af SHA-256: 0967fd1c6479c32b0bab7d13ef2f1ac5a26b7fde473dcf88fed2ba59cf2abbb5
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/33157673811.pdf In PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/vovijopikopabadotiwijuz.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/xuxewikadolefale.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/repebujepefapasuwiju.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/94672045181.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1d6d627b8---5383995754.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/lusagonopekejevojutodow.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbf3f4aebb---53867567902.pdfIn PDF document text
    • http://regmac.net/userfiles/files/severumikawigij.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/pilisopugedokidux.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/tobegagobituriwifowi.pdfIn PDF document text
    • https://t2sc.me/userfiles/13349451612.pdfIn PDF document text
    • http://fullx.net/files/modomisubixelojemebivur.pdfIn PDF document text
    • http://chineseclothingonline.net/File/tipofewoderekatip.pdfIn PDF document text
    • http://goldia.cz/data/file/wetegevonimifamija.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/fesirufilorosoxenuko.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/94530292323.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/jufitodumoruduvemekelel.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ccb8db72e---nuporigiboduwux.pdfIn PDF document text
    • https://cargotavio.ru/files/file/97297995577.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/geramunanavibe.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/52103447687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=cash+out+mod+apkPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF42 26356 bytes
SHA-256: 17f3df01c95c0aacdeec6c5932173f8989363c9d663ae808ee6b07d010396f5a
font_01_sfnt_off000121eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EB 16584 bytes
SHA-256: fa55d09c9f66ccc82478e7bc6346ee5482930484108318100a852d21561aa12e
font_02_sfnt_off00013939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13939 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00014136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14136 10404 bytes
SHA-256: 92841690fda01d649ad9d2d5dcdd87b0947d1719b7a6170a55ffc2f135f6d7ce
font_04_sfnt_off000158d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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