Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5431c32b21cd0f…

MALICIOUS

PDF

70.2 KB Created: 2021-09-20 07:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d77f8de4558bbbb4218a80e3e05fcb6 SHA-1: cfbbed0ad0faaca15f845452de1b2b226ff83ce1 SHA-256: 3f5431c32b21cd0f05cab12e8228baffb209703ac4c81bdf105e42a1a77190f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress sites hosting other PDF files. This suggests a link farm or phishing lure designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b54c6a0e12---17753242650.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8ebec6682---46225226638.pdf
    • https://namhunglogistic.vn/site/files/37485268868.pdf
    • http://badgerhillfarm.uk/67441388775.pdf
    • http://kaztelcom.kz/ckfinder/userfiles/files/40021140402.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2817b12c3---zavasurimev.pdf
    • http://eternaseguros.net/files/files/fojigiroziv.pdf
    • http://shopgraeagle.com/ckeditor/uploads/files/59796549404.pdf
    • https://sanaspinler.net/calisma2/files/uploads/14287436160.pdf
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/vuzaz.pdf
    • http://studiorestagno.eu/userfiles/files/78329929597.pdf
    • https://ventadeterrenosurbanos.com/userfiles/file/76816108336.pdf
    • https://skostishoes.com/userfiles/file/88577302634.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/c42163b2ed9cd80b7cf5c06b6f729cd0/xoseposomemiviza.pdf
    • http://jadeite.ru/images/file/19767104086.pdf
    • https://pointswestliving.com/ckfinder/userfiles/files/lozadakuduguka.pdf
    • https://canionglobal.com/FCKeditor/file/nudapofesiraxukemeje.pdf
    • http://ruiqingchem.com/upload/files/12172227025.pdf
    • http://1000projects.ru/upload_picture/file/69032106253.pdf
    • http://carrozzeriardue.it/userfiles/files/86323129564.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/b2537879e08c415e299c4d49f60ee544/sirujagubowizowad.pdf
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/gozodonotijib.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=android+iphone+crossplay+games
    • 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_off0000b130.bin
e5ca305b5d845da69092835eb82d44c1c502c9ca9405a62f7ad7b163668ee981
pdf-font-stream PDF embedded font (sfnt) at offset 0xB130 16280 bytes
font_01_sfnt_off0000dabd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDABD 16792 bytes
font_02_sfnt_off0000f2d4.bin
07c8ca0f201e3e51f676dc2f9cf2c48100bd59dc7dd6362ac2b0af2e68d4a676
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 10960 bytes