Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf925568bf0caaf…

MALICIOUS

PDF

97.8 KB Created: 2021-06-29 07:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9010aa675d90939c98e7b369da1a073a SHA-1: 85738ca6ba5945d8500279d78d9429c6d5a1a547 SHA-256: 0cf925568bf0caaf64e8f48d3b92652931cfdeb5f20b1860572bc09915a5cc90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable due to encoding issues, but the heuristics clearly indicate the presence of numerous external links designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/iblc7rcveqpr6bass6h6ok589v/nivamowuripefugedufatutoz.pdf
    • http://fzcce.com/aimgs/uload/files/gusexevototajedenobupup.pdf
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/dinapiliwaniw.pdf
    • https://masini-de-ambalat.ro/images/userfiles/pikafamujejodobam.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/b9j97najldb2kec4v7jrrjhj4p/10950297803.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4d3a2bd20---12020963257.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/b0750b3b3550fb22fdff7796e1225eb7/32285781983.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c923220a745---meserumunifalusobofesiw.pdf
    • http://ankamet.com/userfiles/file/1825219228.pdf
    • http://bannermaul.com/userData/board/file/63108566917.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/ae9da0e8478d80588c3210c0f552fbc7/11087341470.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/fk91nbuo9v21h16nt7li4i30ag/pawulijovozixupo.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/b4c2d25fofuplco38v4kima6i9/futalokukosit.pdf
    • https://vansuloi.com/uploads/userfiles/file/47211208446.pdf
    • http://okwmd.com/upload/fckeditor/file/fawizosa.pdf
    • https://agencement-menuiserie-var.fr/stockages/files/rudikorilisikanugepa.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737278d9713---79368688278.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/d90p3f62ehvegcv94e1r77lte0/woraledemizuxodukoze.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d66a75279a---pejagojokoremuva.pdf
    • http://brnc85.com/clients/878796/File/14192454241.pdf
    • http://driver-jazda.pl/upload/file/42906194746.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/b1647f957997d8369c54aaf3749ec82c/xupitagavojefesi.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/799f90a0ab0a63ea58d052b8a902bd1a/94925061008.pdf
    • https://alarrabnews.com/images/content/content/file/fatusumip.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=federal+estimated+itemized+deductions
    • 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_off00011a47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A47 16792 bytes
font_01_sfnt_off0001325e.bin
2a285d8ee3451fce2d5ee727e9e2c2dc42e8b3cbffca3f288dae1b84b9944a27
pdf-font-stream PDF embedded font (sfnt) at offset 0x1325E 10668 bytes
font_02_sfnt_off00014acf.bin
7f54030fda256d66077a5a8b7dd93414f24e9a8a5402fb825f35f08ce38eac35
pdf-font-stream PDF embedded font (sfnt) at offset 0x14ACF 17760 bytes