Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98b9210aa1c793a…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 18:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b91d3b989f2c99951dddf7cf89194c2 SHA-1: 76f4a1dacc8dd0f98878e1c6c3afd918e9156ce1 SHA-256: d98b9210aa1c793a99ccd8c4953a84bda7944161641f4f350a2e11c9c31fa68b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm and a potential phishing or trojan delivery mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent. The document contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://orderbestwings.com/uploads/files/tirot.pdf
    • http://giaexploring.it/userfiles/files/39891625499.pdf
    • http://polipack.ru/content/file/61009533654.pdf
    • http://www.chp.pl/ckfinder/userfiles/files/natora.pdf
    • http://osayit.com/images/file/jatexipedi.pdf
    • https://megatex.ua/images/uploads/file/88574775231.pdf
    • http://alrabbancapital.com/file/files/17793130756.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9486832cd---62550018752.pdf
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/nobojikogosisevuzevez.pdf
    • http://esistore.be/userfiles/file/80891833901.pdf
    • http://smartdeal.pl/files/upload/files/87035456867.pdf
    • http://oilmachineydy.com/d/files/burutegibubediji.pdf
    • http://anm-av.de/uploads/files/gisibexegonuxow.pdf
    • http://aquaclub.hu/userfiles/file/40496447644.pdf
    • http://oryginalnedekoracje.pl/userfiles/file/tejuguxutikanukalufipin.pdf
    • https://kstraders.com/userfiles/file/kewajujezo.pdf
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/ab0a8a6202643371e0be89d1138cd4d9/tuxokirozopevuton.pdf
    • https://sassanoproperties.com/FCKeditor/file/tosadizaxuxigevo.pdf
    • http://vetusmeter.com/images/upload/File/kobotak.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613454cb2f9a8---86397143780.pdf
    • https://whatproperty.ng/ckfinder/userfiles/files/21246551774.pdf
    • http://concilianavarra.com/userfiles/files/17898055941.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=watch+little+women+online+free
    • 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_off0000e032.bin
64f3b5857ffe62906849bc47348cf81af9a5f2a3ac8888afb1685affdd6b105a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE032 18140 bytes
font_01_sfnt_off00010f83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F83 16792 bytes
font_02_sfnt_off0001279a.bin
959d428621af6e146c74c8e4dcff89999ee09d4aea854e96ee909e82524f34a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1279A 10512 bytes

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