Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4fe55586c2e58b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 10:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b46d107e7070a73aa38fa7fa5ec3a2bb SHA-1: ae0e2e9e747393d851b81b9cb2d33843101e60da SHA-256: 5b4fe55586c2e58bedc7ffb245990ae093ae3d33a6c932668153d3679fa25712
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting and are structured as a link farm. This suggests the document's primary purpose is to redirect users to potentially malicious websites, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613c311342d55---76412276824.pdf In PDF document text
    • http://wecans.net/_UploadFile/Images/file/16971706649.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/7253450730.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/23567273560.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/zodurizetudenasolexe.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/26173865487.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efdb499c75---nefodiwixixukam.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/30157297608.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/2325081145.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/2047883560.pdfIn PDF document text
    • http://lse.hu/userfiles/file/14081314545.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/1tbg80c74b7h22l7la09370flp/pujodamaronex.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/8399095130.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/vidibadux.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/tozow.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/wivumiwezakegipekokeru.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/jipulusevakimoxema.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/pixowukiridoravor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=instagram+reels+download+websitePDF 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_off0000dd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 16716 bytes
SHA-256: 183f9f38e5d994ac2d53524447ada7e6fc5cd981111c75b64def49a8eb8ba5b4
font_02_sfnt_off0001208a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208A 10768 bytes
SHA-256: 009c50c4f431da36e0bda2207e1daf43fd9040330e62e2d0f43d20275c745e8d