Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec89f1e81f550bf…

MALICIOUS

PDF

96.5 KB Created: 2021-09-04 21:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b5b5f0ecd87be836723e1d543bddf776 SHA-1: 8bfa3f770c30bc387a3afacf585d822f9c20a220 SHA-256: 9ec89f1e81f550bfc9e398b5d2e26bb71c91664bafbd9ac297281d7174b24c77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs point towards an attempt to exploit users through deceptive links, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://laborke.ru/uplcv?utm_term=signature+%C3%A9lectronique+pdf+foxit PDF link annotation
    • http://gsxr.hu/userfiles/file/nobovedebewumixovikidal.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/348a485c2b6433367829293e2092113c/wisubibazisep.pdfIn PDF document text
    • https://master-service.ro/images/file/jalamifuxepalezotobiti.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/33198566359.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/xijopigovivorusomelozovus.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/dofires.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/87b070848b09812b4ee42967663c0e67/41614924071.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/24658226886.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/31303612025.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/40742856939.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/7753269013.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/natejaribopiretuz.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/5762698258.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161186c163e5d4---87203272175.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160af9f2602b52---jeradanedukupa.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/wufiwe.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/89385758740.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf75ba77c17---kajowebadifaxazog.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ncrmiu41fcougp158thcae3vih/49382040720.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/0673727485.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_off00010f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3A 19936 bytes
SHA-256: eea96cc9eecb89882107b1c093adf8d4b101923b145ef5b1c8c74d9398b5f47e
font_01_sfnt_off00014163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001597a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1597A 11204 bytes
SHA-256: 30141809c1f39f45191f64d9b5897ece99674af072a7fcb1a3bd537b45b5dd00