Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c7d9ec5ee4b577…

MALICIOUS

PDF

96.1 KB Created: 2021-09-12 01:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b33e6ac8b9bbc7be857b43225d140a09 SHA-1: ea8fe9041a12becb6d12c904c23908d3ee9b10a3 SHA-256: f5c7d9ec5ee4b577abdecd3f02a20fc290c46e9646353819b1f031e6a5eee7f5
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://laborke.ru/uplcv?utm_term=game+of+thrones+season+7+episode+1+free PDF link annotation
    • http://meskerjager.nl/media/files/didesuzaxuxaxusuxu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b55f4dada---67282099164.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/3840844854.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/gumiguru.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac48b32cb3---batevalawonatere.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/33dc7f1753beca3fa8da8e17c736aeb6/zigodaledazigafugirikal.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/31237749629.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/xatizagibeganiveg.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/nukas.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/9562964351.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/79044708033.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/62665621717.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109081955057595.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/74891225736.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/27197805826.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/tobukikipuvatexofo.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/batidajonolorewovebun.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62693650861.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631102163.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45893611110.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/86168567405.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/vizujosixesurobudetub.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/vexazogufe.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/5c84f50f5d7688af2d3749bc641f97b9/buvovugosu.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210902192143.pdfIn PDF document text
    • http://feminella.ro/upload/fck/sesuwitetifeguviwokusafef.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_off00010f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8C 10860 bytes
SHA-256: 0a85301f435faaab7c797172f6dae724b7e7e304136c93e31d3cfa32e6fceaa2
font_01_sfnt_off00012890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A2 19060 bytes
SHA-256: de0edf918e2ba9f39e648f2134cb86cf37ea89d972bd1d293814086093802f8e

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