Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4c24dce5e9f4b5…

MALICIOUS

PDF

71.2 KB Created: 2021-06-17 06:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70f6c697548cf9efe3e39b59730d944d SHA-1: 9f1a483b839e8744f4b803a3213ae30af0c7d12b SHA-256: 8d4c24dce5e9f4b54fe3da41670132da8fcbe7fb1fbf8b04a831cb892c57ccab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to exploit users via external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nomylo.ru/uplcv?utm_term=pokemon+home+mobile+codes
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8cf69269c---81780557532.pdf
    • http://adamlegal.com/userfiles/file/87667965840.pdf
    • http://americanewbie.com/userfiles/file/26891560159.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16088be35109c7---midukujafomonusi.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e195fe04a7---ziriwarenebagubokul.pdf
    • http://93564497.com/userfiles/90422896286.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/a999d36b4bcf226d9c6e3a233fb81c57/jobowexubir.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f203ce3a16---vetexabew.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/sh9pvs2r70j1gb171pbolf15h1/fojugamuzopidan.pdf
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/favuxu.pdf
    • http://glotecgh.com/upload/editor/file/pazasovujefalolapesopafi.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/ghoclnt6ji5bik1jsa24hbr4bf/55560795308.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608358cc0ab74---44803423162.pdf
    • http://siembra.me/uploads/files/78510687532.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a00316fa---xamefuraxozagadop.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2ca211992b5d4b66cacfaa660822d094/1387590642.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9c4.bin
33235357b040396b7a11d9b09e776587d62cc71f2f3fb0c887d6a790a279aa23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C4 5080 bytes
font_01_sfnt_off0000eaed.bin
4c33dfca43a817a3f99a58d3e85d2cbb7f277c23091747a2a0e1538143933ed9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAED 11008 bytes

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