Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82665fb9f5fdbf2…

MALICIOUS

PDF

71.8 KB Created: 2021-08-29 13:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ca97931003e50136839e403839b2e24 SHA-1: 8d566fb18b03a87469193013fc847c302f5da56b SHA-256: a82665fb9f5fdbf2e3994b15a850185bd26f0b1deeb50cbd79ab633c8853ceeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicate a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=when+and+where+does+mitosis+occur PDF link annotation
    • http://gerd-pollak.de/userfiles/file/tevipatetubezejobosufiju.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/28441688289.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/foxuru.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/dafuxejepateguw.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/tikufuwulipimoxureder.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608685c1204df---34805886140.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/68990813692.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/navutofixurimi.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/buvijolalobujoze.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/29d6d375a3308f4f52fda5a1858445f2/ninigijewaravomava.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/19428993082.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/kuremodasivumi.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/41698832560.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/c39ceb35571dfe5a936716e2a3852e9d/52469761655.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/niviwuwomomubi.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/duroluku.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/61283198435.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/18960962312.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/11692468242.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac2f4d999a---fobuxixedefekufegalazazib.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104f20ac9f14---luvoz.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/dba95cffafb12a1b3ae695ce67087cb8/55133217103.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/42f58ea2809c452c217ae7583437df8a/20714103220.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_off0000b958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB958 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16A 15592 bytes
SHA-256: 9a7a175170fb4ea89c90743d6d98d101477b4d53f6fa0a7749dbd1839c6b664c
font_02_sfnt_off0000f918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF918 10768 bytes
SHA-256: ead4b46199e1a6dcc8705dc57b6dc6302e648700bc1b15c16497b56aa183217c

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