Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c612d5d05b2f6d…

MALICIOUS

PDF

90.3 KB Created: 2021-06-27 13:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f0cb2caa41f24326f273d119bf36b47e SHA-1: 55b58cd2aac9e9260149bbbb564f4c933442fb80 SHA-256: f9c612d5d05b2f6d60ea9c02bf0a91069e007a2894ffb1a205d89c72edbdaeeb
176 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PRC/3D content is also noted as a potential exploit vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/86o1cdavqou19tbgo1t2mg2bof/58303324136.pdf In PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd289a476ab---23199774871.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/21015538437.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16093ea2557332---1169079136.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/4f91e0da03408fc5b03d1ae7fd6a6632/zolafixotuwetevuwajumu.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7vspcbm330u86mn7n1cjhviaf/86982407224.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/r6gipiddbmbhoo6pab26qm8epf/56219741003.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4c755cc2b---5626538486.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a67eedb45e---vugajamuziwiwemog.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/51009753190.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/35901553219.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/gekive.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/1551bc4748386d5935431614628b7cb4/33322975422.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/89284731005.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885c57d2c21---88382716478.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/66517190772.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f3bc7983835f2756ad0da05ca76fea6d/66562645769.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e550071cd7---mavitowadunamuvidudalojuz.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ffa7b177d---nojud.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/a39c541afd13428911a54525f18adfb9/57656561228.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd935e95c9---80868965315.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/womapigoliwu.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/38169064183.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/093cb67923cc9e8b863ce020a49c0879/30885160737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=savory+candied+pecansPDF 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_off0000f98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98D 18644 bytes
SHA-256: 96ec56020fdd864048aa63f30e374d07a593aab5c679d4a8186408b130d15a6a
font_01_sfnt_off00012a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14229 10616 bytes
SHA-256: 97643ac86550c14b2c57264950ddf598a53801806cd6e2167e8d09cffba177d8

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