Malicious PDF — malware analysis report

Static analysis result for SHA-256 de509b9d07ba2818…

MALICIOUS

PDF

121.9 KB Created: 2021-10-07 14:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a848f42118ef9bcfffcf55ba1bcd08ab SHA-1: 102714e4bd2bf8a06fe5d99ed843feef93742ad7 SHA-256: de509b9d07ba2818c78365589610d6aa450f187040c5470b17478b11c65023fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of PDF link farm heuristics further supports the attack pattern of directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://philabc.ru/uplcv?utm_term=size+of+the+clitoris PDF link annotation
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ce72fc0412---guvelosexaxim.pdfIn PDF document text
    • http://airzo.net/userData/board/file/54775969805.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/fodas.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/razirefuwewonemuzugerug.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/waleporisatak.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/70377713671.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/71857932783.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/laxisevomevufujomipigab.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/nuvabitunebasakixopofoza.pdfIn PDF document text
    • http://infunplastic.com/d/files/98275296171.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/fc8f82e91f2ddb2fb0b63873fd362423/28819642173.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1615e83d1ed0f4---41300446468.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/48981068496.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6225f05f897edae7ed4875ed72b16989/6212403636.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/fopiz.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/36483498698.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/jcl178gnejlj6h725kk469u30p/pogiriwudavipaf.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/84625478980.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/e8018279fd5ffeafeefccae164dca1bd/63969828017.pdfIn PDF document text
    • http://kotolantopeni.cz/file/28625257636.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/43982953798.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/19132572709.pdfIn PDF document text
    • http://agrihitech.net/media/ftp/file/tifurakabe.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/81889757455.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_off000174f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174F0 21304 bytes
SHA-256: 49cbfbde8742a79484f0c20d2c56e88d1a47383b9a87402fc8d11bf803819a32
font_01_sfnt_off0001ab7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C396 10304 bytes
SHA-256: 70b20dab562e23085c979d56bd532a5557bddf566c68f33e8133b78ce2ac5dc9

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