Malicious PDF — malware analysis report

Static analysis result for SHA-256 13912e73415e4d76…

MALICIOUS

PDF

91.1 KB Created: 2021-09-06 11:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 90deb9410ed918cba3f2ff8022898519 SHA-1: 3267e7424d83bd5cc6f20e365d2806c4748a4c83 SHA-256: 13912e73415e4d76cf844875679b5d794205b0f0d1ceb5bd57bf0871b7f39607
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body was unreadable, but the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b84e131c9---favijatavesene.pdf In PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/fijonabiwepoxen.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/30030251089.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/lejuvunebutamovep.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/gamuvexajexebefaros.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4cbc34e38---97180478708.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/b71ef6c59e91693070499073e8773242/27158003974.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/91055745152.pdfIn PDF document text
    • https://coatielectronica.com/files/93102520193.pdfIn PDF document text
    • http://ladue69.com/clients/876446/File/93253677641.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/78947090166.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/fgb7rp0fblsbcbbnga9ao0nu53/sepajene.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/10008003773.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/takisukogijuravosapadese.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079f1b7697f3---88564723765.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/wijamikofegej.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/volnbti70s0auig0l1bl4gv9ff/2683942690.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49cec7d593---fikevesufevoguvuzutefi.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202107/1627704634.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/sawojugapisadosadegidow.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/53026806818.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/pobusiseduwixomer.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog//file/49049314259.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160769ccbc4404---mikifijabepojuxules.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=supercube+6000+manualPDF 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_off0000f92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 10660 bytes
SHA-256: 771c96ec56076f345ff6eb84afd21fa6f3074f41b14aad744d496a6d2b2259e7
font_01_sfnt_off00011153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12965 20940 bytes
SHA-256: 8e91166594043af06eead7f69bdc977848163aefd5527fc693d0a1e480fc24ed

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