Malicious PDF — malware analysis report

Static analysis result for SHA-256 8198cedeb60285d6…

MALICIOUS

PDF

74.1 KB Created: 2021-06-12 18:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d3484ec473992c41a5f18d4c06f9a6cd SHA-1: b7672b161e0bd917fe03b51d26e69361194c2aa0 SHA-256: 8198cedeb60285d69f58a04e31816901696e6804409c106badfa60d9702c294f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of embedded URLs pointing to compromised WordPress sites and other domains, suggesting a link farm or SEO poisoning attack. The document body is heavily obfuscated and unreadable, but the presence of numerous external links indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://oniceh.ru/uplcv?utm_term=hd+video+player+sex PDF link annotation
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/33rtdicjn0rh9m18at7qjbr04p/jaminidijunamovuzuniz.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/595c1cd81f9919c415578d3757387ab6/90998806766.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607659e029d9c---kukanodiderenimemefimuga.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/5da14653de86bac7b4a621adb6e480cb/84198586272.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c156248f1---likoremegima.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/ec24b372ff193e7a0ce05cc120d28d72/jupapas.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/83249138019.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ov8p0bodd1vd4gm4jo6nnld5qa/vokazumoralefelet.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c152062f284---bubutivotatokajipoxuvu.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/xupunanokuxugawuka.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/48756222309.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/tezoraf.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af0c0a1da4d---60581622586.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/faxoxetoxibifafubiw.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/6eedda28e8664856354cfe335b92a83c/2408428851.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A9 5144 bytes
SHA-256: 91a1089039a6ccf349457722b7961da8a6c6cd9c89dc3f62319ae9c0abdad437
font_01_sfnt_off0000f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 10340 bytes
SHA-256: 76a09fd4b35b2ee29e76fa78119abefad5e865bcfa88c75987e9962ff891c643