Malicious PDF — malware analysis report

Static analysis result for SHA-256 2585a6dfc78e6fa2…

MALICIOUS

PDF

77.5 KB Created: 2021-09-01 03:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 39d8caca04addc6bb7f3a244ef157a33 SHA-1: b17fa261e09be18a2bae2fd0421dcf76a8f00fbe SHA-256: 2585a6dfc78e6fa2aef402c627a56262c18262c5b3077e63b5df5c7decce84c4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an effort to obscure the ultimate destination and potentially track user engagement with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=winston+churchill+horse+quotes PDF link annotation
    • http://musthighschool.mn/ckfinder/userfiles/files/25167048188.pdfIn PDF document text
    • http://topstec.com/d/files/lagojuvelurare.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ef8228ebd---dafod.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd0a53f8f---94466392835.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/89671041350.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b18bb9338---26724036096.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/53432471559.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/12265917291.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/nizekesuwiribej.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/gumirijir.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/xadasidat.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/vowebezonapujejasopikebi.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6636426a38---danomodozu.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/getakejevomowadi.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/bsdsatkenuiemp666ghd05rjrd/mivoxesoxijetitapawu.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/jalelotipakowuxa.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/zafiv.pdfIn PDF document text
    • http://beateromer.com/bilder/file/14690717020.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/226788633aa6522aa5c5c3f1044028bf/29679487298.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210626081128_j6ik76.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763c9e250c6---90512216740.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/19621224345.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/jimajijatixezofatosure.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2f26f5ef---dizanifamuwapizavil.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/3efccaa88029ea0251b8258d05d1ff2b/semoleravedegadas.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_off0000cc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6C 16888 bytes
SHA-256: 11aa25d7daf649284fccb9b75dc00fb04ad70c86925bd2ef70e639123eb5374c
font_01_sfnt_off0000f845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001105c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105C 10404 bytes
SHA-256: 50d730cc61a27ca7c9b2a9f375a32d5f8de80c90571deab7246f985100003783

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