Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79ff023d7f4f41a…

MALICIOUS

PDF

86.0 KB Created: 2021-08-14 14:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ba1fc2669f33833be1794cfaa4a9191 SHA-1: f799bf7938cc482df0b7b4170ca6a68f440c44b2 SHA-256: f79ff023d7f4f41aa367f843d609490153cb166e57e04d8de7e87bc7225dd20d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://dj-maily.com/uploads/pages/files/44197375505.pdf In PDF document text
    • http://transcash.com/ci/userfiles/files/zakojokuga.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/30357006641.pdfIn PDF document text
    • http://falerisztika.hu/tmp/8955167644.pdfIn PDF document text
    • http://fxmeat.com/upload/file/dcac5c7cef41edb333273259814c41fc.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/pilusobumewenibanilusuvut.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9de27c4e---fujifebetatajijepupi.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d6495c59f---92531728835.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/99115042736.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/556006317.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/nanogesisuwetixexo.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/35393214525.pdfIn PDF document text
    • http://freetds.net/userfiles/file/jazukir.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/dejebafomenet.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/70452731357.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b155b8cb4b6---29200154028.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093acdaae97c---69964095202.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/12126877619.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a615962f9d1---gikasanukun.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/95842522374.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/riroxet.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/a5ln0kmu9rshb18lbnoldh2sl1/60966920150.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/ee7053c7f03efbbde7102b30d9fa3d86/zufemupewaxekitadap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=basit+harmonik+hareket+konu+anlat%C4%B1m%C4%B1PDF 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_off0000e856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE856 19188 bytes
SHA-256: 9de7d8785f0a34c83017f55783c6262915da79387a522d1d0ab597a0f5ca46fd
font_01_sfnt_off00011836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001304d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304D 10664 bytes
SHA-256: cec32a4b1680f2d5f75efe3ffd99fde8a26191c7875fffd5d70bcd3256eb0262

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