Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e412a9fc82f63af…

MALICIOUS

PDF

85.6 KB Created: 2021-08-19 01:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55a68b120103ce3dbc8cb3ac7e01901c SHA-1: 4a9c29e51a7799269caae9f003e56310a6ffef43 SHA-256: 8e412a9fc82f63af5c00c9d0f76d36a32bf7f4fb4bcb8a26dd14260dde0748f9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95'. The presence of these links suggests the document is intended to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/f59e3fae9bf7a17773be8d7161b1f037/6390860158.pdf
    • https://digireg.org/upload/37099070441.pdf
    • http://sanzmendia.com/userfiles/files/7206943120.pdf
    • http://laserinnsbruck.com/static/vivuxozogela.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160795c6342698---firozejutezume.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/a64f472a942d6b75df09735c68dc7afe/nekepinasafu.pdf
    • https://liantoong.com/archive/upload/files/52272988586.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/sp6ii1hnuqdo41s8ea38buaobv/waxukonanegofa.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/dfmhib8js79qv4toq68ce0uovr/31177066975.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070803181496---zemoronodep.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/fhv1slr34a6o6ob4cev5mfg4ob/xutenugegibizi.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072061b8423b---lomozibiraxetivebo.pdf
    • http://wolfroccatiassociati.it/userfiles/files/93184183253.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746f2dc3214---22609502537.pdf
    • http://technology-mp.it/userfiles/files/58914775692.pdf
    • http://lookkorea.net/userfiles/file/wawipena.pdf
    • https://elesud.it/img_pagine/file/22878360797.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/5ca77b68331bd04198c337c073dab4fb/42892930996.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dea8db7c2d---79999019180.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee55a82e1eb---punatokaloluxaselilurap.pdf
    • https://fishboat.hr/files/31632731750.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/9n7l8t88up9gn241d43s472u23/nodoro.pdf
    • http://parentini.it/userfiles/files/48988858918.pdf
    • https://west-holding.com/userfiles/file/73250149473.pdf
    • http://www.kotolantopeni.cz/files/zupopixokefaxosu.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d8a9e55ab---33303332148.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+use+soap+with+a+simpson+pressure+washer
    • 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_off0000ea69.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA69 16792 bytes
font_01_sfnt_off00010280.bin
522568f7d30d19ad5de5752a9e288fbdb23f068a1f6db2bc332f001bdbd59db3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10280 10648 bytes
font_02_sfnt_off00011aba.bin
a4987fe82364bd2fc57ff3e33f8559dfc65bd21d61549d561e47456c76f5c485
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABA 17180 bytes