Malicious PDF — malware analysis report

Static analysis result for SHA-256 c922be615f675f92…

MALICIOUS

PDF

75.9 KB Created: 2021-09-06 23:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d15b74a1da4b32f662dee8948342dfcc SHA-1: 32765b49ffc687ced6293c4ce547a17257926a96 SHA-256: c922be615f675f9271f5345b05ecd7f6a832c0dd1737553ba5f6c1c4fbd1676a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed for SEO poisoning or phishing. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611051c1908cb---57559824218.pdf In PDF document text
    • http://ateliergermain.net/sites/default/files/file/riwuwa.pdfIn PDF document text
    • http://maidichike.com/upload/files/powofoferusubob.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021081923274122557.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/bca4a2a0920cc5c620e2df81a3736926/96431358048.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/xutufigusefovasojuwulazog.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/buom7p9pk9ubnec3esb16frs5p/bukadusuwexofelepudolod.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/wamixir.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c123a993473---luvodixezepafedun.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/15487996992.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/78399470964.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/9910821994.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610acc882e7ff---688536689.pdfIn PDF document text
    • http://esistore.de/userfiles/file/82937066531.pdfIn PDF document text
    • http://highdesertrent.com/newsite//images/uploads/file/96132615912.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/750cc8e9bfa1705311dd207b2da3d598/getifojuwunenisipe.pdfIn PDF document text
    • http://rld-carbon.ru/file/58098617594.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5c312327e---63104816631.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/jovepoxevowezu.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/46173921829.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7b9dd4731---rojikixesapigowad.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eb91bc6fbe124b24b3f15f827effb74c/moforixep.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608db161642a9---bidipenomanuvuvalefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=precalculus+mathematics+for+calculus+7th+edition+pdf+onlinePDF 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_off0000c0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F5 11036 bytes
SHA-256: e1a6f0309ab0d94367f9d374b9a8b978697ed1d316f77d7a203d3ff2bb327f29
font_02_sfnt_off0000f27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27E 18084 bytes
SHA-256: 529f763b41679bb5f7777c74d5c743ca6976462ed950fc76dddcc08bc5920181