Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8d9c16afa93f7d…

MALICIOUS

PDF

88.2 KB Created: 2021-06-26 15:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6000be18eff38dc79223033d02bc1e56 SHA-1: 44fb930972f1f9c87be42870eb762b70d235591f SHA-256: 2d8d9c16afa93f7d68d864ba667dbf0acc3c2c77b1958b51495286d8dab4e8f4
196 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm suggest potential exploitation of PDF vulnerabilities to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://study-go.info/wp-content/plugins/super-forms/uploads/php/files/c8188dd26418afcb7a233859731317bd/29418567185.pdf
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430031031570442.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/cb74ee7fe2a35e1d5c918a9422b138a8/lopavikawoloxolap.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/joxawis.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160963b1be84e7---52417208497.pdf
    • http://jkphotocon.org/data/userfiles/files/japajoxofusuva.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad702f62437---29366651183.pdf
    • http://sl-light.ru/design/img/upload/file/nixudoperibilovugodon.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094dc050424b---nujusonifarogok.pdf
    • http://freetourscadiz.com//ckfinder/userfiles/files/sukox.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/egr7v32lq6hc7om5n9go8v7th2/bugafimodirevijebaremodam.pdf
    • http://aliglobshop.com/userfiles/file/kudujojex.pdf
    • https://gilbertems.com/videos/file/relakovowa.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993f6ed671d---judowavajofefevopu.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60186ef4be---45431629297.pdf
    • https://amblamy.ee/upload/file/11901779291.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6cedfe5d---36986804343.pdf
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77106948341.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c7566ee41---45480031008.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/01f2f594b0e323e444aee343336610ac/dikedavevag.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/igu03pch2gkggcurlcmnpglu0l/90612823814.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3b5ac3e0---vorabetupedigekilu.pdf
    • http://barrybusiness-crm.com/ressource/devis-photo/files/2920986465.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730914950ca---80885110353.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ftdl8e8brj5epas349f5e0pvi1/58710952936.pdf
    • http://446888.top/userfiles/file/22616761889.pdf
    • http://remontnoedelo.ru/wp-con
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=allopathy+system+of+medicine
    • 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_off0000f17c.bin
d1ed66f6769f416b0ac94d14a6616865005e58d0cddc630927d1306e8b345a3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 10880 bytes
font_01_sfnt_off00010a8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8B 16792 bytes
font_02_sfnt_off0001229d.bin
300b7dca19fa81afdec38b55eadc13f8b027bb3d9706cd8251bc411a7497aaba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1229D 18732 bytes

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