Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1cd4dc996b36ab…

MALICIOUS

PDF

86.4 KB Created: 2021-09-04 08:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7fda6ece828473a2e32f8a3fb96600ca SHA-1: e9168c414763a009d11bc69f34baa0a63fcccce7 SHA-256: 7c1cd4dc996b36ab692ca95348472686391a5d67c9518ab9d1d2f3377af36a69
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be hosted on compromised CMS uploads or disposable hosting. The primary function seems to be directing users to external sites, potentially for phishing or SEO spam, rather than executing a direct exploit within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://geyikkimya.com/userfiles/upload/file/dufupukex.pdf In PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb643e60b---sujerurakuvo.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/77509907918.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/67999165355.pdfIn PDF document text
    • http://ezibra.pl/upload//file/fagosoxazetuse.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76d868bb6c---salofapaberaginuvexilena.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/4201e26c85d94994105519120359e929/jerexupar.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16113835389d81---vedopoxolunetupimo.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/29cdeed3044bcb63d993de75ca64a2ce/novufejivopivekeba.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/vilaramizawexawumakati.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/4fu0u9op5cafq7118jdfhnht4k/mopibofenonefoluzudesol.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607488f4595c7---77823468074.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/79fb5a80400337c67aa13950dab9a37a/nibusuzutavobu.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-17/20210617141101674453.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c621fe3e5966ebf69c975349dab806f2/vitobimakunegixuwopa.pdfIn PDF document text
    • http://christopherdallo.com/file/lunefotukadixejobixam.pdfIn PDF document text
    • http://ranch.pl/files/file/rimomelinun.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/22037957729.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac94894a746---kibubitazusoreb.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611091bbc2112---jarumamimulokemel.pdfIn PDF document text
    • http://web68s.com/upload/files/zunugarorojofimej.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/lunorivegatebugiju.pdfIn PDF document text
    • http://abnicum.ru/files/file/gukod.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/83244947477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=english+to+german+language+learning+books+pdfPDF 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://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_off0000e99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99D 11260 bytes
SHA-256: fc8ea01e211e0503cbd53b9216e2f4920d886e2f247c9ab741a385aabd2bb807
font_01_sfnt_off0001035d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035D 18740 bytes
SHA-256: 0de28ae5404ca9921b5d7b023edcd1321aeb570a7da371b785382a0da322b48c
font_02_sfnt_off00013345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1