Malicious PDF — malware analysis report

Static analysis result for SHA-256 341ca217117d04ac…

MALICIOUS

PDF

92.3 KB Created: 2021-06-28 07:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f7f5e8bb49bfeb9166a489d2cf09a35e SHA-1: a36b72dd19661478f3e1c3cd16e250c3158a9055 SHA-256: 341ca217117d04ac2fef1ac31be9b383829194b29a54d50f84f036978881375e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded links, many pointing to compromised WordPress sites, and one directly to a URL with a search term suggesting a lure for software downloads. The primary function appears to be directing users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://queure.ru/uplcv?utm_term=windows+8.1+32+bit+activated+iso+free+download PDF link annotation
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27a40741fe---lafijer.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/9053229923.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3acc1d70c---14893923084.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750865c96b8---70061047840.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732a25c4d54---tifinusogekazuwavekogija.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87afe6ba1b---tivulepenap.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/50766272221.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/xefaritunikefasumize.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6055692e1---54122576416.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f834bb7fa---87270752517.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099af7dd92a0---39786878915.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7b5e4e5a9---52223791355.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/galow.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f861cb5c0---xuzivesin.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/63f2fa2d0f06df278851fc842c1308c2/93708050258.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/gupebufire.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/9umpdm20924envnje1tgs1c85p/61097766814.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c561874dd06---85706900579.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/7aeprtgs9f1535i118nl6etfv4/vujul.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/17389563717.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/cb8b32b22c76003ff378b24274b6fed4/52374921624.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe49925589---36302594959.pdfIn PDF document text
    • https://alutat.com/data/file/93786375171.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210607090810.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_off00010306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10306 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1D 11372 bytes
SHA-256: e80a86e06eb34a5714e7d6468a3c1b0e5703ab9d490b6f2cc1faf21293a80ec6
font_02_sfnt_off00013635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13635 17280 bytes
SHA-256: e85026713a862df55731ce300ed64fb7d0df41281741f8f9508536aa8aafdb2d

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