Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc926dcf70da93f…

MALICIOUS

PDF

88.5 KB Created: 2021-06-29 23:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 02b955dac9d4ea659ef013e200e99e67 SHA-1: 49bdfff1167f5e78827ba87bde9556ebb3b98746 SHA-256: 0bc926dcf70da93fe01c441472c90d450a9a3fa8a8f0e80443618e531fd9529d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or trojan payload, likely delivered via spearphishing attachment. No scripts were extracted, but the heuristic findings point to a malicious document intended to lure users to external sites.

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 https://infrive.ru/uplcv?utm_term=meme+generator+well+yes+but+actually+no PDF link annotation
    • http://nickels.design/ckfinder/userfiles/files/katulu.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/489eed3f27269e7691c526bbbe75e9cc/nejaxofotokas.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607439c4ec3b6---74001628188.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8cfc9a72e7025a7e62caf5248968dfcf/remawuvimekosokolugoxam.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/25685007850.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/1642782080.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792ec5404f4---gudutef.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a02a38df52---famimuzagakigetedebopiw.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/f7eb5cc80b832bf03db4a114757ecf3a/4922507352.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8d8e91604---bixom.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/23848912936.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fade3562c2---reboveripawesonejek.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/adcc120c3dc9b122f8a5cb3d6678979b/71295241912.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bd2b275dc---wabuwuxu.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/14pvqlj0ulrmnnbjjqoff3h5ni/febata.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/29rsat8tufsbiq5r4p8neq56hn/solopiloza.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae70cca6c68---kepivulogaro.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/fifibinavitene.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/57620930244.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/20192626363.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/0sb36miosfrva0rd3k1700q0oa/81425042719.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/fipit.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_off0000f47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47B 17304 bytes
SHA-256: 1bf132f765d8388bcb052187e4b574bd7c349b6e9b65dbeafc1faafebc40327f
font_01_sfnt_off00012176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12176 10916 bytes
SHA-256: e89832fbc816f5a71f6e68f8a29933deb8a5f35ede47af3b9b697d104149d6f8
font_02_sfnt_off00013adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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