Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5e0939f6c041ee…

MALICIOUS

PDF

76.5 KB Created: 2021-09-14 04:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ceef833134c7a617605804f8069af9d SHA-1: 6249c54dfcdb6d85c384a6f1cb6941708fc8da05 SHA-256: de5e0939f6c041eea5946dff3b68cec24e1b1aa803e1e7e4454861c100fce0e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures designed to redirect users to potentially harmful content.

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 http://gazdalkodjokosan.hu/img/userfiles/file/wowukemuzekokujar.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138537ecab55---85993058072.pdf
    • http://hyundaihungthinh.com/uploads/images/files/xulaturosoron.pdf
    • http://thegioituigiay.net/uploads/files/serul.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137e63b0a531---wimanozo.pdf
    • http://omonetach.pl/foto/ilustracje/file/buxajoverilofutotolibaxin.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/vk4cbm1p2jc63pjsrm3p11fup0/4562938442.pdf
    • https://gdaniec.com/upload/files/jazafasudo.pdf
    • https://araprinter.com/ckfinder/userfiles/files/68659244560.pdf
    • http://ty-universe.com/image/files/20210901_153332.pdf
    • http://fruitvita.com/files/files/joxogofudud.pdf
    • http://dunajecbiala.pl/upload/File/60929215500.pdf
    • https://108pizza.pl/uploads/userfiles/files/foneterisa.pdf
    • http://www.firengo.com/userfiles/files/komubaxokugededefovezip.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd865ea7bd---84141415996.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5321145c1---51036895146.pdf
    • http://debeight.net/UserFiles/File/91346958524.pdf
    • https://astoraccessories.com/uploads/ckfinder/files/17441944698.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f36a43ae54---90364107173.pdf
    • http://zdrowejaja.com/Upload/file/tezin.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=overlapping+apps+on+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c765.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC765 16792 bytes
font_01_sfnt_off0000df77.bin
b38d8d7afb5c1009349628aea34c624c9620e57497a9bab41ad5378bd06f3f32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF77 17300 bytes
font_02_sfnt_off00010caf.bin
45115d2f9f6ec050d7a3a9e6cf8a0e129307f5725b9cb65ec92c375da93b6c60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAF 10560 bytes

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