Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c247b4c313b8a7c…

MALICIOUS

PDF

69.6 KB Created: 2021-09-13 19:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ff3a3d7971d267f7960c5ec4ba334457 SHA-1: b0e31ba35883ced7b514f8845b8b8e8da5e74602 SHA-256: 9c247b4c313b8a7c2f4bc82b222351be77deecc4f47cfeef52f067f65bcbb408
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=game+tekken+7+download+for+android PDF link annotation
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136925f1d53f---98215445661.pdfIn PDF document text
    • http://eternaseguros.net/files/files/40775357709.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c17d606b95---wijexe.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77643777944.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134698d8aa44---1984899000.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/mozep.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/10212864654.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/43148077027.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/934f3d8f6b212af4726b84c3bcf316a6/25518889400.pdfIn PDF document text
    • http://torgoborud.org/images/file/21521942767.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7a49060d9---wulonorobazepiteresemit.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/noteregagoguwame.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/bokenekezak.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32312145063.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/lujekese.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/20455441312.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/vumimaxolopufebakuz.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe205f3f95---zopevajazopekaket.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/goliwanoladuwiguza.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/vegixa.pdfIn PDF document text
    • http://dentherapia.hu/files/file/juluxovugulisatokosuket.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/041d7b522955d1a5723d4ee958d37dde/42437207568.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF5 10612 bytes
SHA-256: fa24840bba7b3f38e2704c383219a3e539a2f106c3f36ce71201e6c0acdcb9e3
font_02_sfnt_off0000e34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34A 14976 bytes
SHA-256: 995fc42fdfe0fd573634368c2074e313f09a44aa16657a71195472fde6efaadb

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