Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1abf44abd9623d…

MALICIOUS

PDF

86.6 KB Created: 2021-06-29 02:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ff40a9df3f6204f0d5d8a2dae58ba42 SHA-1: b91301b669683467a8dc8cbe29635fe0d45b8537 SHA-256: 5e1abf44abd9623d37104b0f5c9d56c00df6841ce2120bb334a28e0450cddeaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/0214f3165ab161caa55df61a2fe17b40/bexajozowerejowa.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/7909f58961df632b117de79d81701edd/29891365230.pdf
    • https://maturana.cl/upload/file/gupapivugofewudinaxokiro.pdf
    • http://local-minicab.com/survey/userfiles/files/rekobuzo.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd7457542c---masupira.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/1a77eac6885ab17402d393bdef462ee3/61062181784.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081506cb54c7---toxutivibuvemorapaxezeju.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/bhpg8vcrrhaao7q6vostg9o451/29880394063.pdf
    • http://dawahcity.com/userfiles/file/xozavofexuvizipusiza.pdf
    • http://fobosgrunt.ru/files/ckfinder/files/lonajifolaxizu.pdf
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/podagiwo.pdf
    • https://jjcfurnituremaker.com/userfiles/files/kazewon.pdf
    • http://animalscipublisher.com/files/upfiles/file/nadikesor.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb86f12611---fejatopomarowapobi.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/iqvqopj7iitndl5bv0jgf5erfk/tufewanopagitededufubatas.pdf
    • http://yesilderecine.com/admin/editor_resim/file/97519709771.pdf
    • https://damsindia.org/admin/uploads/file/kabinaputufobuduxexojigil.pdf
    • https://aljazeerahpetroleum.ae/userfiles/files/7367751842.pdf
    • https://amatnieks.lv/pictures/image/gomev.pdf
    • http://runo34.ru/attachments/file/54528442000.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a450d9e91---pexolilupalem.pdf
    • http://targdenunti.ro/userfiles/file/65539734322.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=on+the+transmigration+of+souls
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed6e.bin
46d2b13f22cb46226bcbfb6b37997d1f08eb6500c4e08300945097fad163ee93
pdf-font-stream PDF embedded font (sfnt) at offset 0xED6E 10784 bytes
font_01_sfnt_off0001061f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1061F 16792 bytes
font_02_sfnt_off00011e31.bin
446215a66cbacb70d5bc7e2cab38ab0ac47810e47be0c6c8a85dfe4d22f2c7e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E31 17544 bytes