Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bfd4701d94b304e…

MALICIOUS

PDF

86.0 KB Created: 2021-09-03 08:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5eb10fb21466b25cd7aeda98b36c98c0 SHA-1: 02e0b6875dc833e7ba2851cfe7cb216f9f0a8d94 SHA-256: 9bfd4701d94b304ee8d4fde34414a6aaad707189c00dc915c1062f88c309de74
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://iccj.jp/images/uploads/fckeditor/file/8522159472.pdf In PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305bcf4b07e---30500156586.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/l07siictgen4pj406bg2v5ehj3/94979844806.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/wuminefisanibokovinazigob.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/c223bb7e8ef2a96590eb17eb3b91383e/kibaboruwa.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/maginemovage.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/girulipovarumak.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/kujolawalazode.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/7fab0ab94d6e8fcf5a2d876eada9aeba/tojejotufusabi.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/831863aac9bb975f088cb784f71de13d/divoxusaduvi.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/33948984830.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40f2304b3b---xopasosomiwuwigufijolu.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/3asqfetkv1l6mslrj4ite7t4qg/fasupux.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/b559a527d45f0e12ad493a961228e52e/44928312840.pdfIn PDF document text
    • http://livestocktool.com/d/files/sixuluzozetafowu.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/lizotijerokadorefateri.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/npra7kvjn729cm4tue80va0gj9/20698468084.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160842ebec6bb6---pepeberinaxe.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/28d228d8fa6e9aeedf54efd31e187aa6/giliga.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/be7a2489b00eb3a168495482abf552c6/32219618980.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/65214777345.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609aee13310cd---xotexujozifodepeg.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16104e677bb5a6---gojujutafovomizake.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/89900296286.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/5179059086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=steckbriefaufgaben+quadratische+funktionen+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 19436 bytes
SHA-256: 8e56ddf5f90b284854ce3d509ff14592b857d26d8554f37e5d96b23528155706
font_01_sfnt_off00011754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6B 11404 bytes
SHA-256: 64f0129877cc1fa5a785475e49c9c214928726277246578a865548eb571aa2fc