Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ac4513f48f9335…

MALICIOUS

PDF

92.5 KB Created: 2021-07-16 01:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2af48ce84952a241444e868bfe025db SHA-1: 98e70cb1168379a714b96739f1c322fdddd4b2ba SHA-256: 93ac4513f48f933520916e71f721d59d0f82c22350d1503b0e898e1f29b7df23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress sites or use disposable hosting, indicating a link farm for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cdmvt.cz/sites/default/files/23876865216.pdf
    • http://artkulinaria.pl/sites/default/files/file/zipopematurotatafeleko.pdf
    • https://acryl-bg.com/userfiles/file/falarovivej.pdf
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/dudisoruk.pdf
    • http://robalton.es/Albums/images/file///dunodulolen.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/0f24ac3bf134b5cce323dd2d746cb92b/99582924446.pdf
    • http://bellina.pl/userfiles/file/zixumopeveka.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5f7164d52---lixabafapagelirubigo.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/c6qms3q6c3v06qsi8fav8rif3l/lididazepefiwenazevewib.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/8cc57cb6e6b4b421cb525b7a23303e39/busobapoxoferobixokadavox.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080431e7a26d---20139212105.pdf
    • http://mtjjt.com/2013/upload/article/files/210630182204670173pmg6p.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756eadd03f1---tojibewipidesuzaxe.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/13365778848.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/e8qc0rj1udaq1itljdkkak5mon/12451596688.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/ditokanekupawelibeg.pdf
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/86584784081.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2a5c891d---wenokepemojovo.pdf
    • http://gintaras.cz/userfiles/file/94952113189.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/40474951367.pdf
    • http://av-jet.ru/userfiles/file/99142679150.pdf
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/dujiragodob.pdf
    • http://glina-master.ru/admin/ckfinder/userfiles/files/kasudisikakenagase.pdf
    • https://rubin2000-distribuitorshop.ro/userfiles/file/luwuta.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/022ee58d2a35659f27a0d796c694069d/66455538440.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=neet+questions+on+excretory+products+and+their+elimination+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_off000103f8.bin
30e9283d34310ab6df0c1e9a906f407f2e299d455dd42ccd85fc31b3e18a0c22
pdf-font-stream PDF embedded font (sfnt) at offset 0x103F8 16752 bytes
font_01_sfnt_off00012fbb.bin
4e2eb56fc0566df3564e79f94f4a29e0da40d228efecdcc5d3c240afbe42e95f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBB 11324 bytes
font_02_sfnt_off000149fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x149FE 16792 bytes