Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee56b4c31562fe9…

MALICIOUS

PDF

100.0 KB Created: 2021-08-01 21:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 421a4c33ca30373aa174e41de0ad86c3 SHA-1: 6ad1b2a276005ce7be66561ae6e31c5bb4ca28e8 SHA-256: 4ee56b4c31562fe98af81b26683a26fb6c755305abda17307808720337930ad2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for Pdf.Phishing.Trojan. The file contains a link farm pointing to various domains, likely intended to host phishing content or further malware. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://huntic.ru/uplcv?utm_term=anet+a8+firmware+update+error PDF link annotation
    • http://akademia-jedenastka.pl/zdjecia/fck/file/31986807258.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/zasejagukofobaroze.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/dinuloned.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608545650d114---39374831959.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/67923030916.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/44385317832.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/04cf0b5071b39bedaccf99a2de1a86e5/nemikigadaxu.pdfIn PDF document text
    • https://actor-conseil.com/files/file/22610694105.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b44ktkavekmooba92j6q8h99s0/99297497117.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45e6966459---64647311398.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b33ff36aaa4---5433210899.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/81970914363.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/97662663175.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/jelefa.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/bapijaginikuseke.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/26495031619.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/80767944116.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/14951489244.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-1/20210501034901211508.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbea27504b---dokopobomozalakunir.pdfIn PDF document text
    • https://agatanorek.com/files/file/20914575776.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a922045b3bb---getipaf.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737d89b2b8c---rupunobitixuniroze.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c02aeb1585---supisezinulodotekolekaz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B27 18372 bytes
SHA-256: b1aec92c5651b3d68a53462ffac67eb65008157ddbd775ec536da0cb8857286b
font_01_sfnt_off00013aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA7 10820 bytes
SHA-256: 04d9c1f30ed2d8d8026a611dffee0fea1e2bee64c248d7912b4c1359f67b0713
font_02_sfnt_off000153b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153B1 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_03_sfnt_off000169bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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