Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6dfe1fb7c3e8889…

MALICIOUS

PDF

85.6 KB Created: 2021-06-15 15:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3630959e4e98f831a0f13c3c961d701e SHA-1: e83bd9f9aa3f897a06d4f7f6d4a3cda6913179fe SHA-256: d6dfe1fb7c3e8889ecad7f01a023e0c6b1cc13a83361247b2180e6a8d1a8874a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malware. The presence of 'utm_term=download+snes+emulator+apk' in one URL indicates a lure for software downloads. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://queure.ru/uplcv?utm_term=download+snes+emulator+apk
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/17ca787d6a3c327eaeccd869d9bbf1c8/fifududubasifutu.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607370ed55647---mugutinunufanepexobowar.pdf
    • http://spy-military-labs.com/userfiles/file/68497627790.pdf
    • https://drsubhashawale.com/ckfinder/userfiles/files/gosojenixobotemagom.pdf
    • https://avgdesign.com/userfiles/file/totiguriwovixedovuf.pdf
    • http://esoftland.com/userfiles/file/vofibovigom.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acf7a0a06d4---ferodoromasepusog.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/88b3548af82da30e524bbd3273c473d3/pufomibam.pdf
    • http://mywayrtk.info/userfiles/file/lefuvinotitekulomotakon.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8df76a2ec---9542221936.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607faeaba8405---24680940955.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4cf31d91c---tofejelarodomugi.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/811f8a183f4070cfd33855302b92bfe5/boxanozel.pdf
    • http://work4shop.cz/userfiles/file/84265901911.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4430bb8b7---76700900556.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb6.bin
b4ce2952d90b069f0ad8bd7e00fa541b483a76d22986eff9fb736052ea00d360		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB6 5092 bytes
font_01_sfnt_off00010003.bin
39a3dc38560e1bcff5f1008a03e4af1fd7bd9b00706842e28b8f3437bc296bc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 11224 bytes
font_02_sfnt_off000125d9.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125D9 16092 bytes
font_03_sfnt_off00013aa1.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA1 4324 bytes

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