Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8fe5e683f20648…

MALICIOUS

PDF

80.3 KB Created: 2021-06-30 12:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2cf72392571f72c41ca083a04bafe1f2 SHA-1: da0a837ae7692ac554a2681f1de90a66644cb577 SHA-256: 6b8fe5e683f2064804a8c22e8fd82556fd1d7b37683557de9c1dd4757a74e662
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to host phishing content or further malware. The presence of external URIs and link farm characteristics strongly suggests a malicious intent to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=plus+one+question+papers+and+answers+pdf PDF link annotation
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8dad221d0---likifiwobipekobagetonetuw.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/2k12iq28hgohhbfvhe55doidaq/mizaz.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/c11c52b5d2df74cf7693b1bd854a509c/tefonugo.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/70e13d80a20679d4cddaae753df9fcc4/80373833420.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608e40ac49bac---nafuvarivesuzivu.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/kbf139d87lmfpcfr9450o9tubp/figozimuzaw.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/h91pptbucvf6hcmfi2ofesv4dk/josew.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971285be546---81726028425.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/e5f51a2a9cfebea5b155893c4ea16b81/68422431070.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d96a3dfd24---60710291194.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/6b47ad71919a6a310ded85b9b3f2f203/30287794752.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ebfecbfd3---39925537345.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/28d4620ccdd246042edc6a084b1a6528/nazafun.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160826e55309d6---bebidawebexisagedejuxe.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210611_D3B72C70E61B43F5.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089f5e0ceec0---65367730735.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/57f1koglpk3jgmd0e1sehkf7na/58102316034.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/96f7cbc7492bc383c6c4bb310753ccdb/bifuvapitokelujifetiga.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074564c24939---toxiguxomatud.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077ebb591c29---13196771536.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/bixabumalarefegi.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/395036789eb029512d3dc73b25e7807c/75351661726.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3dcb20b0a---ximolitonupo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41D 18196 bytes
SHA-256: 98f7dd06c2545b5d04bbd7e52673f8b91e70a1de8500ef9e56fbb492b65d7d2a
font_01_sfnt_off000102f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F1 10824 bytes
SHA-256: 158a44c80539e856fdb0474908a88c5f5643a0ae22734967d81ff6ba9e3accf4
font_02_sfnt_off00011bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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