Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e5dc1b6098e994…

MALICIOUS

PDF

97.2 KB Created: 2021-09-01 21:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1e287e4cbbca094d41aa50233b3f8184 SHA-1: 94734ebc8eaa8b9b6797e36b3b1b94afc21e4d72 SHA-256: c5e5dc1b6098e994a09165da7a986948a4e6375fb56fc4f19fb725060fdc4bad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://peilimineko.com/userfiles/file/xekofuval.pdf In PDF document text
    • http://carrasvilla.es/uploads/files/68670402381.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/bebogad.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/53932656744.pdfIn PDF document text
    • http://e-menu.hu/editor_up/namiwuvufumokokexiloju.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/menarud.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/5582715308.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16075d4b88c8cb---64764725777.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/58141116374.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d125f269f---15156312118.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/vfkgn61k8ikgv5p27tt64jdqo1/84988437183.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/84202818935.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/42139224796.pdfIn PDF document text
    • http://weingut-suppan.at/files/judiperubugodevowiva.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/24099736032.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/serupifo.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f88724144---55455830150.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/43892306971.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/kedamisoxikatopuxesexuko.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/genutijerezepilewima.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/bofaparokimebiv.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/9fvk2di2or3ifg6jpllrds8570/22268078234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+way+to+answer+the+phone+funnyPDF 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_off0001144c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5E 18768 bytes
SHA-256: 5635db194c6dbc4b8ef8e67e9cba30b458dbd61e75d5c05c2f3317b9d03960e5
font_02_sfnt_off00015d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D4E 10672 bytes
SHA-256: a5446c8c88e978d9c81fe6edfd72f245b455784d71d0815e2d8121e4759f379b