Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c92985576f80592…

MALICIOUS

PDF

106.0 KB Created: 2021-08-04 13:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 437cbbcd69c57607ce768d8b7a56d11d SHA-1: 5af99cc858f95bba7572507f9c98f2c5fc751d0b SHA-256: 6c92985576f805921af6e0205af21fae530d60829111b314707b373eb8023309
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://okuninka-biale.pl/userfiles/file/45033035561.pdf In PDF document text
    • https://fwullong.com/upfiles/editor/files/nudonanopositosagusezuxo.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/096cee9385437d3b5b462a17b24f9452/kajuxegitulomew.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/23914551393.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fda35c29c6---miwusikegelarobamimugaz.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160776c396b1a8---fajavesuwogojegobi.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/etrdvq20kqq2s6vfhfuf82abag/wawere.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/4422b3664053e1b38d73dd173af978aa/6627339282.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/gimifes.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/rigepuxodapivup.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5dec5fcc3---wixozepokokufoduzewovunuz.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/47779925726.pdfIn PDF document text
    • http://hudsonohiohighschoolclassof1980.net/clients/7/7d/7d4b1ad73701457990394555a34ab01f/File/vijed.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/5357402883.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/pitid.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/782d6b30d6010cf62aa1bf94bd0ecefe/tibezibanojixegofimol.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/17781801489.pdfIn PDF document text
    • https://epos.nu/ckfinder/userfiles/files/35567820926.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/21ed5fef121d8c8fc8d771f7015e46af/fosuzujarubodusanafebof.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/91329293926.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd7acb4ab9---jinofobelivuva.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/kramab9q2plg22legssbfb1qnf/savuzewepiluwor.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/12cegjbch351s31p656m2nn33k/23681614522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%BC%D0%BE%D0%B4+%D0%BD%D0%B0+%D1%81%D1%82%D0%B0%D0%BB%D0%BA%D0%B5%D1%80+%D0%B7%D0%BE%D0%B2+%D0%BF%D1%80%D0%B8%D0%BF%D1%8F%D1%82%D0%B8+gunslinger+mod+%D1%82%D0%BE%D1%80%D1%80%D0%B5%D0%BD%D1%82%D0%BE%D0%BCPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DA 25308 bytes
SHA-256: df379babbed5e4f8c96813f8c9b0f8c4cc25dd05054b90784f93fc87cd20b34b
font_01_sfnt_off00014871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16082 16520 bytes
SHA-256: bc3fb79d7c44209bafa873268731e674a353056f6838d0e977467d438371cd2d
font_03_sfnt_off000177bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177BD 12468 bytes
SHA-256: 143a152bfaafe61bfce097f6ad15b5b5bd0d22d40849735494179dab681830ba

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