Malicious PDF — malware analysis report

Static analysis result for SHA-256 512dc0d05cf309a3…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 21:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ea42fda66bc5e48ffded19d131e69f7c SHA-1: 99a48ca7a989044e0dbe09005d2b67c15c55862a SHA-256: 512dc0d05cf309a36b3f8c440e5c23c8fcf4b2a3d8cf344483c4dbaf6b94f809
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but the structure and URL heuristics are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pixomot.ru/uplcv?utm_term=by+products+of+petrochemicals PDF link annotation
    • http://elcampoeco.org/FCKeditor/file/65127240267.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/39538303951.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/ac961128dd56f9824b2eb5e1a6ef42a5/14568423404.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/xosapuxibexopenip.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/nofobenogax.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a4aee3f039ec2a91f8cb9562c29cf4f/92621331276.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/wazap.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/litilan.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-07-31/images/files/26903999682.pdfIn PDF document text
    • http://captainkillmite.com/uploads//files/202108041548322957.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/af44ece81f00c30b2c15f21efaa061b1/duvafejanapeguzu.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c9cd2131e5c7a4c5a133bd1db60a2ad/67115341071.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/36230427653.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/3fac0e5121914e757815e77b5bced09d/67215454727.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/4524542409.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c9f91d3e4---piperiworokuduvadoxotixu.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/70707662024.pdfIn PDF document text
    • http://emannsltd.com/userfiles/9978875530.pdfIn PDF document text
    • http://uhli-janmaria.cz/userfiles/file/dadowiwurovibosunaginebi.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/norabomovepelirubof.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_off0000dbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB6 11048 bytes
SHA-256: a7a4923f320f3f78389cb7fe9b828c4e957b271b538df975a6bbfb91ac1e7f4d
font_01_sfnt_off0000f57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 17692 bytes
SHA-256: 9a3c73835f3d80a2c8eaf9ba841d1f376df4def9f32d5f8eb66512309020d588
font_02_sfnt_off0001238b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1