Malicious PDF — malware analysis report

Static analysis result for SHA-256 251a3d566767f5e9…

MALICIOUS

PDF

84.5 KB Created: 2021-07-09 03:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6362064805dca8b4d981916d3cf54ccd SHA-1: 427b8e0713c131a950604f24d44d4f47854aa3f3 SHA-256: 251a3d566767f5e9b85f50d7d8185c58e0fcee9fd6ab362267eed18b0d6c0bdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads on disposable hosting. While no scripts were extracted, the presence of numerous external links suggests a redirection mechanism, likely to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tkquiz.com/userfiles/file/vomak.pdf In PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6042423c8---rotitemulojogemuj.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210630_C39E1A34AC96FBB2.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/8ffd19f7de87d091133a9e693210decc/66705963697.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/74366185871.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/c72702a67cb425e578faa0f5ff14ebfb/nataxet.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/roa5lm4ms066p6bkq44jqdk8fo/pokazagurapebeb.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/3577dcc27de38d0ceaf51531ff1c46d9/nizosoxuzidesunidavezow.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/98d4b4d3b5a00060691ed465e524e8c4/kewubivepifogumeninadiv.pdfIn PDF document text
    • http://abwrva.com/uploads/files/99422018898.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/845cc456500b865571df6988a2c8daff/34601075455.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ac5881867643e91593a56294408b2273/nimarelep.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a449782c6---porutaparukutomakegu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/tgid5e30ttmtobn4nsjcuo6497/21220609006.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/rimapawaveriwad.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/bejipotuwuser.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46949578c0---rezokesemavi.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/duxidarema.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608592707f4fc---gawik.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/jivixirulirawuze.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/97273900564.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/jdl4664lqg3s395kr78rk1cv0s/89863299228.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89c120e940---11940989069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+oboe+shopPDF link annotation
    • 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_off0000eaf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001030a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030A 17216 bytes
SHA-256: 2de63c86658025b15c698d728e1e915829f7981ab693bf7045071cc90446759f
font_02_sfnt_off00012fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBA 9848 bytes
SHA-256: 0fff315517380509741313ba2a12e9740b345c76a113dc5e3ea8af37acd60926

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