Malicious PDF — malware analysis report

Static analysis result for SHA-256 13dcd74bb4202425…

MALICIOUS

PDF

74.9 KB Created: 2021-09-09 00:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebf375f65c3f3cce28c9ea778a9a3860 SHA-1: b37ae11667af0c8f666089938361bb000ac375ea SHA-256: 13dcd74bb42024256402f35b32dbb7d494f69d7041c7bf27ff1afcf100b18554
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. These links likely lead to phishing sites or malware downloads, aiming to trick users into clicking them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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 http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/sdvcmt3agb6lo2n721gqr0ke73/46091126818.pdf
    • http://elsekmont.eu/userfiles/file/fejivufo.pdf
    • http://www.tobywells.org/media/fckdir/file/bujositonedukugopunaxob.pdf
    • https://easresidence.ro/app/webroot/files/userfiles/files/69212843927.pdf
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/69619383954.pdf
    • http://libron.pl/fckupload/assets/file/55140388353.pdf
    • https://daotaolaixesontay.com/uploads/file/71208993869.pdf
    • http://360global.ca/userfiles/file/93213150892.pdf
    • http://ambulanceservice.pl/userfiles/file/81220605719.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/dc0bdbad0efb222d996df99e3b2ccd8e/14785921398.pdf
    • http://poltinka.ru/userfiles/file/94802640271.pdf
    • http://neonatal-surgery.ru/userfiles/files/sisomudatomebemumed.pdf
    • http://ibookingkr.com/FileData/ckfinder/files/20210906_8C951D47E3D83360.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f66ea2594924aa5be80d83fd63e3ff00/jorezosegulovemilegono.pdf
    • http://popnmusic.fr/userfiles/file/65371336666.pdf
    • https://dichocungtoi.com/userfiles/file/sowaluj.pdf
    • http://thermogroup.ru/uploads/files/83876211465.pdf
    • http://mail-ex.net/userfiles/file/topiperesokufosirolus.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f77677867---somapotavurumoguwe.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/5684a2781d0747cbc3f76a2dea8e0a7a/jarelomizexubularu.pdf
    • https://alshuka.ps/ckfinder/userfiles/files/27899674073.pdf
    • http://mabifitness.it/userfiles/files/bozik.pdf
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/xusagatavow.pdf
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/22227813895.pdf
    • https://intersat.lv/files/file/97937109484.pdf
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/sunibagodovagomi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=hungry+shark+world+unlimited+money+apk
    • 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_off0000bcd6.bin
d1bde8ce145ce36dd1a85817e497516a98264b96678628d5f09048ca73509f8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD6 18440 bytes
font_01_sfnt_off0000eb7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7D 16792 bytes
font_02_sfnt_off00010394.bin
8fe3d4be6e681fdaac058fcdc98c2bc33c9498cfed0c82db5a253d2e7e507664
pdf-font-stream PDF embedded font (sfnt) at offset 0x10394 11220 bytes