Malicious PDF — malware analysis report

Static analysis result for SHA-256 b075c2f71926c0fa…

MALICIOUS

PDF

78.0 KB Created: 2021-06-18 12:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90cd59bfa0029e93c171a043c9528e33 SHA-1: 043d1b3716b966720c381fe0258c23e547095f6d SHA-256: b075c2f71926c0fada106abaee10711cb52fae4d36e04dfc9c0cd3dcccc45c7d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to host malicious files. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs suggest an attempt to trick users into downloading files disguised as game modifications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://drafthe.ru/uplcv?utm_term=gta+sa+mod+apk+obb
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d00396fdde---morawaverewusanolevolona.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be3c41bbaf---33227930991.pdf
    • http://sanarina.de/ckfinder/userfiles/files/kizaxufogufafaremenagini.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4d1fa1c7a---dopewigixonebupebiv.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/44dd89b37767034178eb2b3b4a89caea/netosowono.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0dec3e5d5---59355799210.pdf
    • http://kulturazebrak.cz/userfiles/25143993452.pdf
    • http://atek-ent.com/upload/file/20077994339.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40df8ec646---vusewufefibobadawenola.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/c8c82ca0d91aa7994f82dcb7ed7fee0c/gupifoz.pdf
    • https://bbpartner.cz/userfiles/file/29527839121.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c18ea463edb---faxiw.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/48ccd0e65fc34f3309a82da603b18a2a/pokazamawajoj.pdf
    • http://surmounttravel.com/userfiles/files/25574130878.pdf
    • https://yingzhaoliuart.com/upload/file/19603781499.pdf
    • http://amandamaitland.com/images/file/kamapegelo.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eead918b62---tidozipigovoser.pdf
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84064642154.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160786d15ce99b---kiwurad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e592.bin
8b25ea9fe4029ab211682f7d860eb4da06ab95a2b70ac27a899b750f0f74c890
pdf-font-stream PDF embedded font (sfnt) at offset 0xE592 5212 bytes
font_01_sfnt_off0000f73f.bin
b341e8204e7d4c6cca888e7a860bb20ed659393b1612351fe512e677f17f7542
pdf-font-stream PDF embedded font (sfnt) at offset 0xF73F 22760 bytes