Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab8db9900672f92…

MALICIOUS

PDF

81.8 KB Created: 2021-08-01 00:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5239a3264254627911e85f563275ac3c SHA-1: 3cf61fe3dfdc10d0a20d7504b2b16a745adf8748 SHA-256: aab8db9900672f92b60f1f35fb06966153d423c2541315ae2377205ff4282acc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous URLs were extracted, many pointing to compromised WordPress sites hosting PDF files, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this document is designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/cdacf992dc6c78a7046f29f5b6a5e09b/gaxegeredogidoxe.pdf In PDF document text
    • https://hgb.se/filer/file/69436506630.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68a6f2ab88---bugezubedifoludababad.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/1faaba9dffe7f5470165872a454684e3/8548264410.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/lobasoseditonipozezavu.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/85764061077.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070cac82219b---nuziterurubamizame.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c1a2296cf---goxegodogizivisosuramak.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763e1d42580---wekitubuv.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833a033a672.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/e2d1d1d29f4b09beefc11f4f287388dc/23724799610.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/72617697986.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfad63d4d1c---17546893426.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/70886383726.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/bolemiditakip.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/56887807604.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/64416127808.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/dujexodanudokefeni.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/29007926398.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/61964074891.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/fikuduxovixogat.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4d164e34e7a035f72cca8e193ab45e26/gekad.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e1b8a006ba28a776ddf560a67daf4cd6/sutabudezujatanavev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=cheats+para+pokemon+rojo+fuego+en+espa%C3%B1ol+gba+androidPDF 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://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_off0000dba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA4 11644 bytes
SHA-256: 784aac91b1c8a7adadcbe8d50a086cc4dd7f49ea80b80370bb7abd864a518f56
font_01_sfnt_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 17200 bytes
SHA-256: d53d55a050e863d7dbc41391517f2e4e3096bc5887c26db71867b261f7d38b18
font_02_sfnt_off00012205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12205 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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