Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef68c7eda4f2b14…

MALICIOUS

PDF

102.7 KB Created: 2021-09-03 05:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6ce627bc4cfbc05ac01de0cc64873d1 SHA-1: 441d84eb4f34b427187409e034989e144bb71ffd SHA-256: fef68c7eda4f2b14d3d8d20bc6f3dd716ffe6e58e23d923f7ac4e76bfedb4fa9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://garglob.ru/uplcv?utm_term=valor+elabora%C3%A7%C3%A3o+manual+de+boas+pr%C3%A1ticas
    • http://www.hgbehringer.de/img/files/files/32415979964.pdf
    • http://beulahcooleycollection.com/clients/870349/File/texufogididoketo.pdf
    • https://geneticapanama.com/userfiles/file/kupunokoboso.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a2b7eb184---45520589939.pdf
    • https://andrejc.si/files/file/95853618721.pdf
    • https://ptogel2.com/contents//files/rikasepota.pdf
    • https://conrays.ru/f/data/zepav.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/70143182835.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4e2588af549e3540df5ef1e03e89dc3/fozizefusisofipotegeb.pdf
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mavigijujef.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a00b2f51c---5251031390.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c855180a897---79155912965.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/76708ad1330d19c80a6cfca80d338978/vuraluwukufugixutezu.pdf
    • http://3e-recycling.ru/app/webroot/filesfiles/mutopisanemozuxotinum.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/12d69a1f25e410e0c9ca2d43dcffc913/lezirupujeniru.pdf
    • http://epwuae.com/userfiles/file/4979399178.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/43eaf92f77a551fae8d7cb6e4a842fc3/sosimutejaniz.pdf
    • http://apexibd.com/uploads/fck_uploads/file/legeta.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608428110cb06---larejufisatol.pdf
    • http://tischlerei-schlusche.de/sites/default/files/file/41347353373.pdf
    • https://vanvoorst.info/uploaded/file/37614520496.pdf
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/33890112755.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_off00011df1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF1 16792 bytes
font_01_sfnt_off00013608.bin
866bba2fe68caa0d5482ff955e009a6b6db7cc07e6ab50691b77170015623664
pdf-font-stream PDF embedded font (sfnt) at offset 0x13608 11528 bytes
font_02_sfnt_off00014ff6.bin
5b2831be14ebe6a4059db97054f6e75e14796168b48ee8febb5bd11b1f65c1a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF6 23064 bytes