Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbfb3ca02f60950c…

MALICIOUS

PDF

98.0 KB Created: 2021-06-30 20:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c798e9a992664b2d5437e2ebec289c80 SHA-1: 8c347d76c45b9eab6b88686faa89e4936f4fa96f SHA-256: cbfb3ca02f60950c9ab7bb236c7c020d7aae01b80d7d169a604f864286b73b20
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URIs and link farm patterns, suggesting an attempt to redirect users to compromised websites or phishing pages. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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://wastran.ru/uplcv?utm_term=how+to+use+dvdstyler PDF link annotation
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/g7hud5sn43c4f2eo1ovlhol8pn/fetovapa.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/eb6ad207962a3f6e84ff312075518770/newum.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/witezuseki.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f594f0704f---48442726799.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606da00fe45a2---37246544682.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7c8723104cd979e74765b9980d2ffa57/duvakubejad.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/fufobazanaj.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d6c2086e2---giretokigi.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1184bb3f2---bulijo.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/diwirizagajupi.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-6/20210506222020432120.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/fdfafcaa33ca2ff412b88d8aec56f75f/bumigesevosizunakanonine.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/35ab0cd5321b37a3a1383b4bb92cf99c/viledoxewozowosuvatuzim.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/fawim.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/91197088857.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc6deb153c---lusunebasevile.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e1df8eb84484b5759aa7166a13ecf208/pifabomelisokubexunumu.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/sa6vu0g8mqmhgetkjcc53s67es/tinuzejef.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/morexedekiguretovoxo.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160708733ee7a8---44783321694.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/a0a45f4168148c3d0a3b0af0ff830afa/19370961341.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/bipeduvufesulitutower.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16097e46ec2d25---moroj.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001044c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044C 17828 bytes
SHA-256: fa9880b9c1e15315bbab144b2dab5cc389af309036d8c2b3c6908bb8ae9dde9e
font_01_sfnt_off000132d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D8 10240 bytes
SHA-256: b23590e4e99d92d37c18fd64aaf08a121d34ea0be338ce71a9acb49ff7f2fe6c
font_02_sfnt_off00014a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0E 16504 bytes
SHA-256: bc6d022e4f146895729d02f1a2144c43bc66eab368af5472f517888fe2d62b46
font_03_sfnt_off000160c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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