Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3697b69ce3b8144…

MALICIOUS

PDF

76.3 KB Created: 2021-09-02 22:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 212a13571e221ffe8f7fe5941a7959b8 SHA-1: 4e7001345b3876185645575e55de2f7056565f3c SHA-256: b3697b69ce3b814490c703157e78d5d6651dcee343f34137221697cc5de98a3b
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b59402ab0ec665055b5fa782dd0e267d/88777252607.pdf In PDF document text
    • http://turatabor.hu/media/9191138485.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c887795b228---tezejubugasi.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf53e89215c---49231213266.pdfIn PDF document text
    • https://ckmandarin.com/uploads/viwufaxivelara.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc1e29b1aa1---94861732348.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/44216487095.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160728b5d5de7e---sujimasazesapeju.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/19966753830.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/zanatosilul.pdfIn PDF document text
    • http://beateromer.com/bilder/file/19144975586.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/xozixid.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd1a9de015---vunuzatepuluzivajeb.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/273054247.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f45a6fea5---foribejapolifav.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/dowirinapivekekujonif.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160789d1f42aef---wowadigukusuve.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6ac7b3bd9---62147858900.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160fa8aad7b7ef---kevofogatedebulisow.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/dekagozuj.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/29726750629.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/33i263i2b9f308kh4a1cosjvc2/8545048531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=defying+gravity+wicked+piano+pdfPDF 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_off0000c385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC385 10940 bytes
SHA-256: f41c55ad96a42452bc79588264c9d35c918044de31d835891b187fce921adf7b
font_01_sfnt_off0000dceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEB 17844 bytes
SHA-256: a3076ff3a8cd836512bef33c3e2a577307f55a5b68caa5e8c27e9f0b5efd8751
font_02_sfnt_off00010b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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