Malicious PDF — malware analysis report

Static analysis result for SHA-256 d97fe1a632ab9394…

MALICIOUS

PDF

77.0 KB Created: 2021-08-02 17:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fd56615a6f639626f210ccd9d5fc36eb SHA-1: 139f5ca553bc2e86a45bfd01269cea4c00829cb8 SHA-256: d97fe1a632ab9394c680be5a37ce17eb779dda576871c4498aa74c13aa236792
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links pointing to compromised WordPress sites and other domains, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lead users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/15be63044725b1813fa3ac3d88cb7e80/gifeza.pdf In PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1666cd5dd---97502503428.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/34595852716.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609785ff75c94---4648078241.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5d30043ed---84120173746.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/rudediguv.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/rutiz.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/bozogekosuf.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/24455287368.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/86ogo6unme12u3bo6uupugqlm5/89677330946.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbe19a3f78---60592244511.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/cilb43qbk9grrlohp35ndfafjg/wovusupazozenetibujet.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/cafa51cd6d185ce4e6aed77da849fe12/vegasetejeponuvutomagovub.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/80215576526.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/81669701770.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/memoguvunepilukunutasi.pdfIn PDF document text
    • https://campermagazine.tv/public/file/55859890370.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/geganutufami.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/pedububasem.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607a00933490c---pogibusenumemixokirewanog.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e0g11qhs4pmns9k3crd71qcr3/43709490346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=libro+matematicas+segundo+grado+2019+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_off0000c444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC444 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 11576 bytes
SHA-256: 2d05e7d4641da41cc624141382c67c1b153770e4e1d37a1cc5753f170d39b60a
font_02_sfnt_off0000f781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF781 17492 bytes
SHA-256: baa96b32b58767752cc12628e590c4d44ab09e5265dc3228b6ec04aefa4f5359

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