Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4de703ff1038e23…

MALICIOUS

PDF

70.0 KB Created: 2021-09-19 00:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33dd312abab91bd1212eccf55d7c8a88 SHA-1: bfe1fd537169f7252317f7fe6887f026f557d7b1 SHA-256: e4de703ff1038e23fea686f8db7ef934ebf985d63b6fc3c051d783c3477b3c81
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm, indicating a phishing or malware distribution attempt. The embedded JavaScript stream and ClamAV detection further support its malicious nature. The primary goal appears to be redirecting users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 7

  • 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.
  • 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=how+to+get+all+skins+in+fortnite+for+free
    • http://tyextractor.com/d/files/zevexukuxuvena.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145aa5f8d9c4---robede.pdf
    • http://ibb-online.ru/f/file/89884774336.pdf
    • http://duancanhotot.com/upload/files/polujikubo.pdf
    • https://movie2book.com/userfiles/file/nofopuvunugodazimi.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135c4f126a0e---savorisi.pdf
    • http://aygroupmuh.com/image/files/79167736521.pdf
    • http://incomsistema.ru/ckfinder/userfiles/files/buwoguxijok.pdf
    • http://ajarnveerapong.com/UserFiles/file/30557654409.pdf
    • https://ooo-kenk.ru/userfiles/file/65210802317.pdf
    • http://adria-ex.com/images/blog/file/31225448465.pdf
    • http://laboratorioshamalab.com/userfiles/file/66977508542.pdf
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/51597597873.pdf
    • http://kimhoatra.vn/upload/fckimagesfile/duxasavusojotuxobonek.pdf
    • https://sharedsynergy.com/userfiles/file/tepof.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/58c1045182afb7d2f91b493b53b9fe12/1838802003.pdf
    • http://pomelieagency.com/userfiles/files/nabeselakasuxowedif.pdf
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64787524803.pdf
    • http://longbienco.com/js/ckfinder/userfiles/files/6129522598.pdf
    • http://ccadl.com/files/20210914122747.pdf
    • http://dedanskecasinoer.dk/userfiles/file/54892947145.pdf
    • http://bargiel.com.pl/ckfinder/userfiles/files/72751387792.pdf
    • https://ashleymongolia.mn/uploads/files/93367486315.pdf
    • http://pazzo.jp/js/upload/files/zikaxosujesupabow.pdf
    • http://pekbdt.com/filespath/files/20210919050648.pdf
    • https://suacuasathcm.com/uploads/files/ketigekurid.pdf
    • 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_off0000b416.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB416 16792 bytes
font_01_sfnt_off0000cc2d.bin
15a4f72b4a443ca5870921395a32c473945ad25af4cfbac477362ba7b796bc2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2D 10560 bytes
font_02_sfnt_off0000e46a.bin
dc8c93e4d8a070c58b86484ff19dae6d19e2997b8c78808bbae2c19f0a95356a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE46A 15480 bytes