Malicious PDF — malware analysis report

Static analysis result for SHA-256 671bb08ef641ce95…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 02:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c1d93a8c73d4ce7ffa78f53b563b9c89 SHA-1: a9a3f79c3a19115b48889ae55008fc711ecc5390 SHA-256: 671bb08ef641ce95b939e9423c4ea3bfe161fac53ea54be124fdc6bd77d7a05a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically within form upload directories, suggesting a link farm designed to host and distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5aaa39f33---zujurax.pdf In PDF document text
    • http://deltastal.ru/userfiles/file/61657776329.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c71ee3d22---gagenuxowidimuteleze.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6604f2dbc---mixadixujuvunidavo.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210527_145513.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/39119195975.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/68c7bf4222cfdad110e745d99855b19f/zoziwiwunapoziparominabep.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/61486857044.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ab85658c6---sotodenu.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/laxenugulabojopadijewi.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/85511457236.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/70230878096.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/tevetifixe.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/71f5ae040a91d3d6c7dcbab6c4987e49/sewiwelapepugixejetelawi.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb727562dae---kesosututumof.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/14180023261.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16109ecc57853e---rolanediragarunaz.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612eade697e78---23017113391.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/gilasijor.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/zekoxova.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/xatoguwulavizemutad.pdfIn PDF document text
    • https://vestol.bg/files/file/15611960556.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba32237d82f---tapaziragugasaganu.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/jowotaxazulutiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=quality+assurance+supervisor+job+description+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 17644 bytes
SHA-256: 912213f1e10a51ae2df6ed45b7f644d8c08f9346339ed5e9efe78a68474f9ce8
font_02_sfnt_off00011d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3D 11220 bytes
SHA-256: a55c8e311aa321de1576a5f3e487de5207fe0ae5b814b8ae5542f70fab3f3ab5

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