Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f85dcbe8018db40…

MALICIOUS

PDF

77.5 KB Created: 2021-09-06 04:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dcc6365928f6bc104215954f998571c8 SHA-1: 5604ae271d15688ef25f21ae820d75a3aff74147 SHA-256: 0f85dcbe8018db40548486564154f507d75f73586ecd669a6413824bed74094d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. No scripts were extracted, and the document body was unreadable, but the prevalence of suspicious URLs strongly indicates a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=thinkpad+t480s+specs+pdf PDF link annotation
    • http://adria-ex.com/images/blog//file/72940956032.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8591a6ff---8585410997.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/c01acdc893cdf10c137e94f63d718273/bovege.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/996851079c6e38729486a71353b2dbe5/60814212216.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/91926483177.pdfIn PDF document text
    • http://aven.su/userfiles/file/41830566320.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe65bc5fee---48220016617.pdfIn PDF document text
    • http://usagimatur.com/files/others/gefabikiw.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/gibaf.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/29663682153.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb5c278ba---12151175192.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c78408142cc---99152935396.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5dc05d743---linipedesurerefapafukug.pdfIn PDF document text
    • http://uniqueaddress.in/crm/files/xifadonizisilaze.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/nupikevovaxaxogiket.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/669496113.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/4420117009.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/kitojejevimunigiteke.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/bilupubumeworu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b7b4275b6---64841539887.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efbfab94a2---65804111932.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/80318108372.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210822170916.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/20299671096.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_off0000c656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6D 10916 bytes
SHA-256: 20114586d764733aa52c9e49598ae68eee0ba48bd27a62da4eb9822c52aca17c
font_02_sfnt_off0000f7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AA 18500 bytes
SHA-256: cbcd0473855de443ad4bfcf45de3df84ea355edc65f4748466ab246df82b0f79

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