Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c63714241ad2d8a…

MALICIOUS

PDF

85.0 KB Created: 2021-07-09 01:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0fd7da314af293987e9d19d6e9fa2b2a SHA-1: 2c75789d5a8ee325b60b0e70bb50d27efccf345a SHA-256: 2c63714241ad2d8a7949627bd590370cdaa0db141a21d45488c9fc0be4afed6f
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress upload directories. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document's purpose appears to be to lure users into clicking these links, likely leading to further malicious content or downloads.

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 http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7635d08e42---8103646426.pdf In PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca947b1c7c---pupevabazumeku.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/0b7cbb706b3b3dfb9a424bde71cf86c6/gufokogavagixakijimoximuf.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be56456981---vixujomitozefegixokidezar.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16089e2543e3a3---77309489668.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/66e16022fc2b119da7842f9d6d68cad4/28154458595.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/77375964267.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/pabulufik.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ad0a38b96---fokujujisomupa.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/dab5c41fb98a708fb76c78187e1bee46/xewisag.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/bajusifuwinuxolinorafe.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/walifobebi.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/muserenikalajabikopup.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26d1e34c98---fepufemolu.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160735a8cd2261---rerigavukorobodadef.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/bofufolupesijabuj.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/885185ad539c894f6b0202c1b7a8a79a/nojolakowibojakuto.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b52ab89387c---foxorimagovudajipota.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d435d45f6a29bfd33c923c6f661c4ff2/57578308527.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/dabanaxazobumilabonum.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/219aaf3d8a3c1615e4c14252ea094956/fakolelesemunera.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/numuruzanemojarufofosaro.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a559e3bd243---xumotodejoxitivilet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=nitrogen+discovered+byPDF 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_off0000e8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 10636 bytes
SHA-256: 913dde91d9e1d034144b3b0535d52f28b10ad825349e4e80d71e65569ae77bdc
font_02_sfnt_off00011949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11949 17560 bytes
SHA-256: 6091900ef12eec60323aa601b9bdbe039b9643cd966dfcc35c16268a584876a0

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