Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b74ad6722259f0…

MALICIOUS

PDF

86.7 KB Created: 2021-09-23 21:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee6b5531ee3ed5bb651e614ecd6fb921 SHA-1: 97eb7fa91fee2f023647e9ca04f3187b2bcf9731 SHA-256: a9b74ad6722259f0e3a25386a916067bfd290797cf8d074c82da4a9faf77e14b
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains a link farm pointing to various compromised websites, likely to trick users into downloading ROMs as suggested by the UTM parameters in one of the URLs. The document's structure and embedded links indicate a phishing attempt designed to lead users to malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.farnostbobrova.cz/ckfinder/files/57144068927.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8ed96cd6b---29241533277.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/9e6526d6ba4e013d09164325f2bb4b98/64810147504.pdf
    • https://pieseautocomenzi.ro/userfiles/file/80540615635.pdf
    • http://versobrokers.eu/userfiles/files/dofafinakiwazus.pdf
    • http://unixsensor.com/uploads/files/202109091204415007.pdf
    • http://koppeika.ru/userfiles/file/70009490530.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4004b9daf---wokudezagidifebafidusip.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8b1745548304cfc78314ab1388b64390/tujoberuzirenoleligowiva.pdf
    • http://cheumst.com/upload/fckeditor/file/4744954776.pdf
    • http://orkoien.com/userfiles/files/40133506205.pdf
    • http://glttek.com/userfiles/file/72217490374.pdf
    • https://bharatbiodiesel.com/userfiles/file/vifumikipapakugoxe.pdf
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/94c709539c0cd5fd5747a691a1b2f26c/rakidexiropakar.pdf
    • http://hanasushimenifee.com/uploads/files/mugevepojelo.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/790fb61cd0c12c49d07d204b41df0a27/8634426658.pdf
    • http://alfatreyd-mebel.ru/archive/images/file/32934607762.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161389c3d9df7c---40330669642.pdf
    • http://bawaconstructions.com/editorData/file/89714510654.pdf
    • https://commonwealthsportsawards.com/userfiles/file/mazagodizin.pdf
    • https://mavibusiness.it/file/2380505067.pdf
    • http://studiozoppini.com/userfiles/files/59213090476.pdf
    • http://goldmustang.com/files/files/terejeranuxe.pdf
    • http://pappteam.hu/userfiles/file/2781909938.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=psp+roms+free+download+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb2.bin
ba33664762b822b6b3fb1b1e2d4a04c2008bca2514f955127b1ccba34b86e083
pdf-font-stream PDF embedded font (sfnt) at offset 0xECB2 18444 bytes
font_01_sfnt_off00011c3d.bin
9f3f460ea01e82a21aeb7f1ccdffe2a652e87269c69b5d5ddb528653e1106020
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3D 10648 bytes
font_02_sfnt_off000134a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134A1 16792 bytes