Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f9055b26f1a50c…

MALICIOUS

PDF

86.8 KB Created: 2021-07-03 00:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26fea44d7c96ddc40cb5e7564d8640c0 SHA-1: 9a4974401474765fbe7c93d892756abb12deb948 SHA-256: 87f9055b26f1a50ce58ec79ef4037dc1687f8a6c994eff96845d0a07a2567f1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to distribute phishing lures or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pixomot.ru/uplcv?utm_term=euro+inflation+rate
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/845637b2fbdd37e798f39919016fd6b7/buwizunulaju.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/nabru7a3hi3scgb9lmdmi9j30k/fanivafutajejezalul.pdf
    • http://alliance-ic.ru/uploads/file/matimejowujobitevonotasa.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/cde7mp8715g6pcocknt32ulmo0/vipowopolanoko.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b91db671f---79181292238.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49a9e70d49---kifafatabiwut.pdf
    • https://cutandcolorparrucchieri.it/file/26621855718.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/k1n4o2b16r9scob5kk3ahqq280/54063159965.pdf
    • http://k-souz.com/userfiles/file/pilelokofilegamemux.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160944527171e2---32363781967.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/p2seu055d5loc3g9ir865bnk95/zunewupakawiguvagav.pdf
    • http://ottotech.center/userfiles/file/11771570440.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b2d64dd16---miwovukezofezu.pdf
    • https://penal-garazh.ru/files/84386055010.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160df3c922fdd2---gebivepak.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/3e5d7b1801cd64e7184a5ff3b417f554/voxafogawisokit.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/kncsn3s6e48ba8v64o0aqlm8t5/2221267885.pdf
    • http://grawerlik.pl/userfiles/file/559891343.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809b0b36629---xinipu.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/tb00i3kqkccbj7j3mhugklann3/lunuwidatudazifosegu.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c35d7a25ff8---11533417798.pdf
    • http://ajivikafinance.com/userfiles/file/fumopifo.pdf
    • http://bestbelly.org/content/files/files/54173472250.pdf
    • http://kameleonhastanc.hu/files/file/61488522963.pdf
    • http://cloverdiamond.com/file/wilik.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_off0000ee4f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 16792 bytes
font_01_sfnt_off00010661.bin
8106c9b0810ec03cd8d5a755067c6fec3c08aefffb5ebfc6e2f06715bc048e9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10661 17832 bytes
font_02_sfnt_off000135cd.bin
ec7bf8900b65d56f71fce5b5dfa2ee730a9448c01440c22d093bff9a9f102ff1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135CD 10120 bytes