Malicious PDF — malware analysis report

Static analysis result for SHA-256 22fe50cf95b9a1de…

MALICIOUS

PDF

76.5 KB Created: 2021-07-08 09:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2df79921864ba8607a5fcfa8331f83ee SHA-1: ec0c5d809cf621be63c29de4f8aaf857213f874f SHA-256: 22fe50cf95b9a1de2aa2462a3dc5e2bfa5ecab17dfa66b877e14ba5f5c239902
156 Risk Score

Malware Insights

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

The file is a PDF that functions as a link farm, containing numerous URLs that point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise, suggesting a tactic of leveraging vulnerable web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://wastran.ru/uplcv?utm_term=kylie+minogue+santa+claus+is+coming+to+town PDF link annotation
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/g5utqlq7ffj79vtq1u396u7874/2210155651.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/kuxobavudig.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/wisat.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/1be66fa6969a2754f406924f4236ab63/vibufibiruponekegebesipaw.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf747c63f2---fepopolaku.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/miwamonebagabu.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c7657a671---20209293521.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/tilevikukekakuruvem.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079cf7956e47---sobomizuwososaxinel.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/lezivotav.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/bedazifeg.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/3227353816.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/fs0hjtqg2vpbcb4lclurof7571/96730350360.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a27c78006db---40619462827.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/e7a30c53d789926dba6366e4761ca3f5/tozerusakikonanus.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/41764299313.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/32977158782.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6c85534a2---ferokosegegufixamitid.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f02ced25a3---58580400382.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d666ff9defe---sufumumazogafikejadodus.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/40810783614.pdfIn PDF document text
    • http://ashioke.com/images/library/File/79362447290.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/wafonujuwasutaxadopowiwan.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/sncac28crqts2h18figea7uhm3/33045272647.pdfIn PDF document text
    • 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_off0000c5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B4 10764 bytes
SHA-256: e20b22a8846f24af61e38e8cb36b895450fec89aaf88009fd0cdb749f17f1e11
font_01_sfnt_off0000de8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8C 18216 bytes
SHA-256: 6d6ade573e56c2c6e55bfff43e14829ac19aea195e55ab2d783179afacc4062b
font_02_sfnt_off00010c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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