Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb85e4d52cbd899…

MALICIOUS

PDF

76.5 KB Created: 2021-09-04 03:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d13d4a4b73aeaebdd77aca205101c362 SHA-1: 6e3a9026365e5cee5951e9349a34bce095866814 SHA-256: 7cb85e4d52cbd89912ea4370ef6aab6f59a8130da4e408ed3dee47bf75c06a85
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to other PDFs hosted on compromised websites. This behavior is indicative of a link farm designed to distribute malicious content or lead users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/9f39970dff43c87ee237ae22954db85b/riwuwip.pdf In PDF document text
    • https://luminex.pl/upload/file/beketukesadas.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ae48af3d4---siponatixitodutemej.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609702218fc37---vewedesazolivumip.pdfIn PDF document text
    • http://sbkf.org/files/files/benadutowa.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/68f07794e881931dc4c604d0fb34508d/70340743956.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/joxipedumepirerasuliv.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/60366276371.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/badefotesasolinewa.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/kefavitafomepasotawufaraf.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/19232511158.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/46563808702.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/zatawumigogid.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/33995692960.pdfIn PDF document text
    • https://lusagroup.mobi/images/website/user/files/mokosuxozorexetusewe.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/f0f9307476d5a6b7db4a0fc691ff40c6/11036352053.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210710_8FDB386D7583A476.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/ec82kfkdk3ktpjtvfth8hdbfs2/98540272264.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/kagumeboxit.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/fkn1ne7oq9f8g6t4gs1nq7rddj/nobesuxapo.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/xojarolukuforejavofatola.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c0abc24b5---zifom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+edit+pdf+file+using+acrobat+reader+dcPDF 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_off0000c6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D3 17128 bytes
SHA-256: ace1d03b2dbcb637636d08eeb6e4274f5be6a3c37a8c4dddcceaea65895e85d3
font_01_sfnt_off0000f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 11112 bytes
SHA-256: 0789281bd7bea41e49fad3625bbba0ddd39d949db1e1642e855e065870d4b36a
font_02_sfnt_off00010c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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