Malicious PDF — malware analysis report

Static analysis result for SHA-256 22996b2cd5faa5d6…

MALICIOUS

PDF

89.5 KB Created: 2021-07-15 23:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b24425595005d2c3663716df58665480 SHA-1: b028b413cd988fdcb6ea6d01cf05f5789e8a1d64 SHA-256: 22996b2cd5faa5d684b5f5eb9f179c0d168e655b5843569f43694ba5fd8d1195
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 pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure victims to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://nomylo.ru/uplcv?utm_term=baker%27s+cyst+images
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/8ab3ff038a9125c6f22470bf0c7b823c/8900065399.pdf
    • https://mavibusiness.it/file/6911646081.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/92ea9e01b0ca676bb1c1c310a5c83c81/86425934217.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/02jm3q3doo0t1eonvm6anvk2t1/51725431890.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ffmg1n4lphhhsn0hpeum5a1497/35477910550.pdf
    • https://bloc-immo.com/images/guvewatukira.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b248b53db73---31147790897.pdf
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/40850669424.pdf
    • http://systemsbiology.at/uploads/assets/file/lipipivewofuzeneji.pdf
    • http://bvsaigonbinhduong.vn/uploads/files/43292822691.pdf
    • http://hotelbelleepoque.bg/userfiles/file/17976646330.pdf
    • http://www.alcera.ca/userfiles/file/bezemopepexuloduvamodaneb.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/224bc9e9c36851f366793bd253f1c4f0/vipuzifajul.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/a3be7281aeb9092a16563e67663c3194/bogokodexarano.pdf
    • http://chroscina.com/userfiles/file/dirabotemomu.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/51f2139f8083a8029eee7712a4a00a05/xasisepegekaxizinide.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b3304fc381070f50c1cc68c238d4a1f6/80619627879.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609db06587438---vijafo.pdf
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210701191440.pdf
    • https://dijitalsanat.link/upload/files/57567064018.pdf
    • http://dgn89reunion.com/clients/862287/File/4327971068.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086b698a5d55---27759628954.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/o14n0sr1r0gggese6pu06negb5/juvatorafusegafemuwe.pdf
    • http://branonperformance.com/ckfinder/userfiles/files/33936712879.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_off0000fd59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD59 16792 bytes
font_01_sfnt_off00011570.bin
752c420b25bb0beafb8844224ea3c655df5807f4b9ec0714f7abdcf5014f5b76
pdf-font-stream PDF embedded font (sfnt) at offset 0x11570 10596 bytes
font_02_sfnt_off00012dcf.bin
c70e9c9cdc87db5c03ab33f1a889d46c992ef2aacfebcdb252051fb22131153f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCF 16580 bytes