Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8bb796ec123ed6…

MALICIOUS

PDF

65.3 KB Created: 2021-06-19 03:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8e8fd068ab1db52e214b09485f9b8b1 SHA-1: fc04d22be70f73a8850597c8507fae7cedbcd510 SHA-256: ef8bb796ec123ed63419c38190108f707e8ea20826f2f7ca67a426875f261266
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the nature of the link farm indicate a spearphishing attachment attack pattern.

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://srldirect.com/ckfinder/userfiles/files/30506553370.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a229e9a5cc---rusufadixasuwez.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/nahe16jp8m3bfsvst9vfd8tt86/98865333247.pdf
    • https://bravo-hk.com/userfiles/file/34595226373.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/l6bc3e2v8b5jc3sct61id0gn0j/sesokozukorezezemu.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/44d2cdf49da55413d8ae9941f88403dd/20269771339.pdf
    • http://ampletrekking.com/userfiles/file/59014278045.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8ddf4f715---xuzetojosomaxelaguxoredo.pdf
    • http://lookkorea.net/userfiles/file/33780132192.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/8c5ab8a276207c792e4c60284417c148/mixixujunaside.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/uro6gv1ao9b6075qgncl4eeja2/mojikakurorejepin.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/bd857113dcb5859ec1ccbad5bf1f27ef/joliberekirorudul.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a240804ac9c---65713493521.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c486d667881---rojipo.pdf
    • http://yuha.be/_files/file/15748905389.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bkv9h9e0mjhtr8ku8f107qr2e6/nirozetoginiputijix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=star+wars+light+of+the+jedi+ebook+download
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1c3.bin
6ca1dd383db309ad5e9bafe0181ad310a9c73c74372a81c0d82264bfae1f0244		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C3 5644 bytes
font_01_sfnt_off0000d4fc.bin
fd87b137556daf766d652c1ac7486c47866597e2cddf45c122830910a11f8be7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 10412 bytes

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