Malicious PDF — malware analysis report

Static analysis result for SHA-256 4893fe022f52c7e2…

MALICIOUS

PDF

84.4 KB Created: 2021-07-07 22:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be7b494cd91a3eeac0acb8940b5cc83a SHA-1: 79f83f026b6006acf35c0b4c891c9c90afe1ab37 SHA-256: 4893fe022f52c7e236bfd7c6f3ac41073d8b318cae07840b236fbf661c02ac44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/iqqcfk73nv8634q0u6539lcmf4/zejaxivezix.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/7039424294.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/f26547c0c64a49107a253305c55b8f5c/rakavosakikovok.pdf
    • http://toeicspeaking.net/_UploadFile/Images/file/43731280617.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4fb48873f---gafajusisuxaw.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23455311c1---90788784799.pdf
    • http://lab4050.com/upload/editor/file/mezawujoberulati.pdf
    • https://autotronics.vn/userfiles/file/38465435163.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079b9e0928d0---wiriwukudup.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16081e019267e9---fumoga.pdf
    • https://boyanbolyarski.com/userfiles/file/widuvowabo.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bd29eeb6d---wotuzisutibupe.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/962e1b793cd634970603e21cfb709e10/66559058729.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a45b66cf3a---68474611305.pdf
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/95188245257.pdf
    • http://pcwest1980.com/clients/9/9b/9b13e9c1eb96aaf026ead536bb80a376/File/rijidubizifanefekal.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a722deab56b---wabijokofadotawuwibaji.pdf
    • https://peterdegendt.be/file/27817394859.pdf
    • http://raegcafe.com/uploads/files/16470182495.pdf
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/23858872372.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/oidge21ecah6t8b9h670aacc02/jigederejijuvefivof.pdf
    • http://4bx.pl/public/file/49434617375.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=musical+notes+and+their+names
    • http://irodori.kir.jp/files/file/52908970922.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e864.bin
0b5a3a119ff63cd06d39f0533ec85dd9dd01e38a65de41024aa93e3cb62c9d74
pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 16856 bytes
font_01_sfnt_off00011397.bin
7dad8f47d3da2a38822ab1a7efb9bb11bcc9087b815486ed8d06a672bb107f3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11397 10728 bytes
font_02_sfnt_off00012c0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0A 16792 bytes