Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6369f252ef3b694…

MALICIOUS

PDF

71.4 KB Created: 2021-09-02 16:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6c813900a65c897600d3903d7fd55d49 SHA-1: 983ef98bfb2fd151dce5bcfcc6b65120c4b2bf9d SHA-256: d6369f252ef3b6947bf421146ab1976c831e67821b8586d590ed1db8541705ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is classified as malicious by ML models and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign designed to trick users into downloading malware or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=xatar+alles+oder+nix+buch+pdf+download+kostenlos PDF link annotation
    • http://humanitool.ru/userfiles/file/dovuporatev.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/b2c8a1b6fe589171eeb8bdd392de5818/1449948146.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/gazugomo.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dc70f68589---xipejesijavisumizikuvisej.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/26373120782.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/02bf80958f33ca1c5d2b73f1ca6c4ad1/fedaj.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/f2urnhdv005kfgsvafgtio5qc4/57476160037.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/xatazezofuvabuka.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/88517021178.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/75116829803.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/93417261604.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/93303077085.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16111914287912---65145842709.pdfIn PDF document text
    • http://matras-devison.com/upload/file/11956268438.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/1202732053.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/cc6h8ftvfg6fl8mq4ka6cmn687/riwefifukutefegifepixup.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082f9a253612---49431173211.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b8c670793bddf6a3bc7db9ddc9e790f1/pogodurabosanezetizanof.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/44233181867.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16086ef3d61808---18821585167.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/26392534552.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8085e2a66---58301689519.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161066ccdae560---78936080649.pdfIn PDF document text
    • https://doitoutdoorz.com/file/HAt3oOTRPlCqd9de.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/makojixab.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_off0000b3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B3 16824 bytes
SHA-256: 00aaa685ce398397ee45d626217dd859219f8bebf70e7024f6811d299caf91ac
font_01_sfnt_off0000dd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD86 11244 bytes
SHA-256: 918815448fd97ca99104f51cdde86780592f6860c484cc360dd21655e37a1965
font_02_sfnt_off0000f7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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