Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bc78e562e39852…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 05:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9bc8253060f0087a1e80cb65ccfd1368 SHA-1: 836dd0c6775eeffd08692038ae38f281ee354814 SHA-256: 91bc78e562e39852ca53f5752a3968af7ca165254b984ee52fe24acd9028e64a
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 or trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. The presence of numerous unknown URLs and a specific ClamAV detection name suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://loaamtran.vn/files/usersfiles/files/wobusosexefofikimizewiwa.pdf In PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/7350291398.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/lufovut.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161306569acdc7---wijixofe.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/kanuwajimekituxusiso.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/wokepopoke.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/59471086905.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/11995106353.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad98e9afa5---19501175553.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/2232366243.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/70460467129.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613632441f312---rasagajar.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/28257177601.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/lasanotisevokasusetiv.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/81388067284.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/52599234681.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/55437909704.pdfIn PDF document text
    • http://orenprom.com/img/account/file/bizerenuvejisebaduwu.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/22510836860.pdfIn PDF document text
    • http://horvathortho.hu/tmp/kifanaxinabesixuzubazore.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/sogexupiwowu.pdfIn PDF document text
    • https://rubfila.in/files/file/47391969747.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/86408017375.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16132cd21bf74a---poxaxiboxejoxi.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/92643528225.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/nokibeguziti.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138fe282caad---2283331835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=free+android+backup+softwarePDF 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_off0000e6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FE 17176 bytes
SHA-256: 91bb3027e8478501ff2e0b4d6408d3ebeeef1f1563b496b7aadcd2a6c4e5e7da
font_01_sfnt_off0001127e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A95 10960 bytes
SHA-256: 0a9c4aa44e0fc69279f8869b2c28ae60be94badfd5c841c51400e370e562d67d