Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa33dab5236989b…

MALICIOUS

PDF

81.3 KB Created: 2021-07-10 10:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9f232a9009d311bc7463a814eaffd873 SHA-1: fe131dd97b34b272f93b4f8516b0912a8173c5d2 SHA-256: 7aa33dab5236989bce04dd79ccccf99ed98932d2ce65aa68ff2a528c0e118ec5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://archism.ru/uplcv?utm_term=meaning+of+compering PDF link annotation
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609207ca1500e---90804709195.pdfIn PDF document text
    • https://birotex.rs/images/files/78778507651.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/xidetiwonerixeli.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608de65b36b8d---remavofotelifululiga.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb304ce021---21832427856.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/17095259833.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/300831586894.pdfIn PDF document text
    • https://akemi.ro/hirek/file/16381564497.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ba1b40c15---pajomupavovewinomive.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/zasela.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/59280971832.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/xerobukedugib.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/nevuvofewopadilenig.pdfIn PDF document text
    • http://valeneighbors.com/userimages/kowifome.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/2802227958.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/vufidawuvuvedojivo.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e44ca942b---zipuvoxuwajazewilemilol.pdfIn PDF document text
    • http://sun-tes.ru/files/file/fosadem.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/21045266068.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c34dc956e---piwunut.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac041c8944c---13948774504.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081699f45068---68165863184.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_off0000dc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2E 16840 bytes
SHA-256: 26c9a7e840110e39bc481d5e5b8ea9c5aa280fb889995cbe0e8f6ef1fddcc994
font_01_sfnt_off00010876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10876 10504 bytes
SHA-256: 96094f724a3a99a4affd3b5d0085e3baa753d6881e505f7f5aa9ba2ab1329a07
font_02_sfnt_off00012047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1