Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d7667c688789f1…

MALICIOUS

PDF

95.9 KB Created: 2021-08-06 06:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 81920d55a961be3016b420ade38ed9cb SHA-1: 7fc65608e8b8c553b9b7220a5a96fc3e8b413dfa SHA-256: b7d7667c688789f15bd3ec1814900814a35968b0011a0dcfa00c13a53f56360f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were directly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e50e3dbf7d---19187131131.pdf In PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wiwubovosupovawajetu.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f224d73f6e---kovokujom.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adc57497d52---bibupujusexini.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f03dcfd7a7b---82797522672.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/jusetedilatudejokeke.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/makibokidineru.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/07011e4d7d48b299f1e713c5501c68c3/vowilelixefila.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/51671004126.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/xetejas.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/4isqcosjop1spv9ajnl4q3f2nt/95966320450.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/tededijemoxamoranomarij.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/28770725139.pdfIn PDF document text
    • http://aa-nusd.jp/xexunopuravupupowebiji.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/94436979251.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/lefigej.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/5ruih9h1tp3vu0hp73rtd9pb3b/wumirisalodakudeje.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/35692528952.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c63b5392a5---dozeteminibukejokuloniji.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/81003217565.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/24039355194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=crimegraphics+tuolumne+countyPDF 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_off00010e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12696 11064 bytes
SHA-256: 1dde0940955f004c66924d682012b3f897f5689e8b87d7e7de3e8f635f0514c1
font_02_sfnt_off0001403f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403F 18440 bytes
SHA-256: 265f5b784761c79642ffd5df5984ab60a0c98f43464388162ee44c29fb65685b

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