Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c3f3c3ccf6b636…

MALICIOUS

PDF

72.0 KB Created: 2021-05-30 00:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 03d70eea113c62cb8dcf88c8b662ccad SHA-1: dd69dd8fb0d436eedbc894c18cdf6dfc95f9a0ce SHA-256: 21c3f3c3ccf6b63669fb0b8a48324ef89ae6d5934d6b009a62c3f501a70d62bb
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution attempt. The heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious content, potentially for malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160985c4950042---96039878483.pdf In PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/dfcbff08c4ac4d9b2bac0243508b15b0/vegizixakumawinakofovo.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ec880b24e049b352bddab6ee3a927b7a/17465789485.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83655c7a3---12563037159.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/859606ed3c96673d0d5c96d33bf35370/68725917752.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c8b658a8cde6a3c6efbe5b53626cd76f/pajuxogidewuzuvab.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/0841fcc2cbeb856cc53e2b3c9e6aef2d/57916199585.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095eb4bb6e35---zixajibusivesof.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2dbsb4p926b3q7js79pe897v52/22758016715.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/bdfa766837bec5428f4521d352db68ba/60891515481.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2c8f97dac---lalipu.pdfIn PDF document text
    • https://wagaskar.com/media/94940775872.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/39404634000.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/12086900016.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/7b1e4c10ca564ceb0af858b2bc413301/zesubu.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085d7886b723---kabovuzavikomezefadu.pdfIn PDF document text
    • http://usmleworkout.com/files/file/57578294949.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3c4143c13---82249285254.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/39555940627.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/c7e0b0a47e1caf925eb5e5eea2457f5b/99910367824.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=4+bedroom+modern+house+plans+in+keralaPDF link annotation
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA94 5396 bytes
SHA-256: 0dee67dbf19c723e88dfdde9694e8453cad3783d1caf53aff0e1e2992d45470e
font_01_sfnt_off0000ecb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 11156 bytes
SHA-256: 149fc1a843639251ca3d9418adeb206eb0495ca1651658de479cf16e4c3a3338

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