Malicious PDF — malware analysis report

Static analysis result for SHA-256 954ba032a88245e6…

MALICIOUS

PDF

92.5 KB Created: 2021-07-07 22:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eea92b6cf5b3cf42ba52e5c518deb7c9 SHA-1: b9f569969a5bf97a161a7ab017956574f541974a SHA-256: 954ba032a88245e6b358387f5fa05d95fd3505a9187334af8176e39f44ba4482
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a social engineering attack. It attempts to lure the user into installing remote support tools, a tactic often used to gain initial access for further compromise. The document also contains numerous links to potentially compromised WordPress upload directories, suggesting it may be part of a larger phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/07c851eb77278803845172edeb727a2a/xukobizu.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf91abe39d6---7986974566.pdf
    • https://weeb.nu/userfiles/file/83260014614.pdf
    • http://tfh-filter.hu/_user/file/65521198396.pdf
    • http://alibabashipping.com/userfiles/file/31789445710.pdf
    • http://soft-pro.hr/upload/datoteke/9198877698.pdf
    • http://jonkmp.nl/img/cms/file/beripupewajitek.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e162ede680---vobux.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/tnb5b1i4qqb7fivo1adtb4qtk5/69988304308.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0661e91e822e7f47b72ff41a9a8aed0a/64262752019.pdf
    • https://dintek.eu/uploads/file/dosuxenob.pdf
    • http://asijskepotraviny.cz/files/file/6464138508.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b55573f13---22987915121.pdf
    • http://www.contectrade.hu/fckfiles/file/26700470971.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8193770b2---toxiso.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082478ba44c8---38333644004.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160949b7344628---19863583999.pdf
    • http://jiehuist.com/userfiles/files/35916951586.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ded95271a03---wubasenawowarim.pdf
    • http://ahdjcm.com/upload/files/12014522522.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/7adad4ce075c9a0fdb7ea79c5e200f1e/98435410428.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833b9ed943f---40742813435.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/ee2fb67c99a7351a758de6a62930e204/jerijinozefut.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cba708d8c7d---bepibifidi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=gearhead+bluetooth+mouse+mbt9650red+manual
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f05f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF05F 16792 bytes
font_01_sfnt_off00010876.bin
93f4f41b7d7141d349d31396a20e9a8e9fe1f8d81264f5a85cb7e54745a7cf7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10876 11292 bytes
font_02_sfnt_off000122c3.bin
f09fe38b83f87c3ef8f5390e2dd415a35b9f5b4ec81c92e5148ee6eb11808280
pdf-font-stream PDF embedded font (sfnt) at offset 0x122C3 22868 bytes
font_03_sfnt_off00015d3f.bin
0a4af374cb035e676210909e4790276a619635896d879aefac6ffd5912e9aefa
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D3F 1668 bytes