Malicious PDF — malware analysis report

Static analysis result for SHA-256 f658688bd2528937…

MALICIOUS

PDF

98.3 KB Created: 2021-07-08 18:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19df2502ccb1fd92833d3d01d599c4ed SHA-1: 67c956b3ebf876f3752dd2e0a14fbdd118d16f75 SHA-256: f658688bd25289377c68dd82ac56e9590c5b583b00a9feaee3b2adc3211003a8
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://iltorg.ru/upload/file/wemuxexinalejot.pdf
    • http://railwaysrailroads.com/upload_files/files/50859989427.pdf
    • http://buffagiuseppeinfissi.com/userfiles/files/16742253805.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbaa019136---pisixamedus.pdf
    • https://amitadevnani.com/userfiles/file/xotirarebamivuter.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/jowamapojevuf.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b26053b1155093e9ebaf51a57b8d24ca/nobufobi.pdf
    • http://h-st.nl/bestanden/files/93444588509.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c588edd77fa---kinuputisanekofobi.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcbd18440a---sawubegezowi.pdf
    • https://activepymes.com/pub/file/68035572914.pdf
    • http://shuswapladystriders.ca/userfiles/file/8828565930.pdf
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/wonamuxokegorade.pdf
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/xaxisotuvaxe.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078ef03c376a---73276708848.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ladybird+clause+in+florida
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c31a0f8de---magufotafiwesag.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_off00011d0d.bin
2c2a906cd626113f703f789f4b590a61396066164b85cc876068e621d073a13e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0D 17792 bytes
font_01_sfnt_off00014be0.bin
80e4d2f5454888b8caaee44c4bcf9aa6e28b7fae25c9347e39cd242fb665c5b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE0 10680 bytes
font_02_sfnt_off00016477.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16477 16792 bytes

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