Malicious PDF — malware analysis report

Static analysis result for SHA-256 3004af91ecad0b61…

MALICIOUS

PDF

93.3 KB Created: 2021-09-23 03:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a80b697c101394a20da6a39ac3c9e2ef SHA-1: bd392812550cc263d5abf14a1e5d27ba048d6ace SHA-256: 3004af91ecad0b61b495cd67ea7fac91557108ef765a970e7ebfb6b17a9054c6
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, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and link farms, suggesting a phishing or malware distribution scheme. The file's structure and heuristic firings indicate it is designed to redirect users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://cructi.ru/uplcv?utm_term=padmavati+movie+full+hd PDF link annotation
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/e7099a30b6b91213f11377cf74c1cfb5/59286360583.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/45869891595.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/n5id13k35ejq4vcgafhh0s6ho3/63443610801.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134c071b3965---nutuvejorewunuwito.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/memodimamiw.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/bijubudolujenepi.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140d5760efda---pizunaj.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/16102681604.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/55311692936.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ss6pbc0llborph1ooq3hqq1g7t/zudebema.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/mipeboxuto.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/52688616677.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/44211736687.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/purejipiwuxomorof.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/zepefopodilarajebifel.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/52049878471.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/razosovinibebuner.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec24b0eee2---sovujekerutuvafusate.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/26823807397.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/bazosi.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/17509963878.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001080b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080B 10412 bytes
SHA-256: ea5727c0b444d727684cfb3f5caad3c067cbbbec3768bf33aa8491c537096a0a
font_01_sfnt_off00011f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9D 18544 bytes
SHA-256: b7f608a22215e2d5a67d4b0b97a57d710aa288ab0b6759ec1123a4847e2ba584
font_02_sfnt_off0001500f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1500F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1