Malicious PDF — malware analysis report

Static analysis result for SHA-256 883239e4a3b0336a…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 07:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b80fa4783e11645c3f4d04dbeac42743 SHA-1: 05018ba526f088125ed2b4f85b335fb8766fa7b0 SHA-256: 883239e4a3b0336a9ff56fd3d980e06e9186ac55700baef5ad3a701be01bb111
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=live+score+tv+apk
    • http://ljjxmining.com/uploadfile/file///2021090116374629.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/8be6097efe1116b51bf4bc8144cd576e/98849787593.pdf
    • http://advocaatindex.nl/images/uploads/2166662531.pdf
    • http://polymer-optix.de/userfiles/file/31301451372.pdf
    • https://cristalparkhotel.com/ckfinder/userfiles/files/24640827283.pdf
    • https://hearing-outlet.com/uploads/files/202109151254041093.pdf
    • http://goksirkrupskimlyn.pl/img/upload/files/99771228294.pdf
    • https://neksav.com/upload/ckfinder/files/kajodifilalofami.pdf
    • http://files.ibiza-ferien.de/file/94605936416.pdf
    • http://otczenacts.com/media/files/muxuwojepak.pdf
    • http://jlicentral.com/images/authors/file/pelukufoxanajumatedano.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139f8fa4442c---najedelow.pdf
    • http://saxonrt.hu/img/userfiles/files/jafizakazalokadekerada.pdf
    • https://weddingitaly.jp/images/file/29493672006.pdf
    • https://tierlistei.ch/downloads/97758072731.pdf
    • http://owop.challengersports.com/ckfinder/userfiles/files/ginipunapuned.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/22f183d0624a94388445cf9a74b5c23a/puwomemefejuwag.pdf
    • https://legouic-peinture.fr/userfiles/file/minuzexinuvopagelitetewu.pdf
    • http://phoiinnhiet.com/images/uploads/files/13878984300.pdf
    • https://pr-dienst.ch/file/15712208394.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/40c26d16b2c74cc011b60f563df7eb50/rapaboxujebi.pdf
    • http://healingtown.org/userData/board/file/zedejixulazupaja.pdf
    • http://ukwoodrecycling.com/userfiles/files/12777105855.pdf
    • http://demenagements-remond.fr/userfiles/file/20210915133310.pdf
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/47527312045.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_off0000d717.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD717 16792 bytes
font_01_sfnt_off0000ef2e.bin
827f207330759374ee0cd4b2a704020747a86c97782066e2ff63e988e45f11ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2E 10332 bytes
font_02_sfnt_off000106b5.bin
c34952632ec4fab3a7b210c38f6a7eef72a859dc3ce6184da6708ff8b0fdefc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 16788 bytes