Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0d783075167678…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 03:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd15510cb6c6ac99e88393b4e4453769 SHA-1: 1b95ff420c2b3147f6200ef046a7acb388b0720e SHA-256: ec0d7830751676780da0d285e20e5f7e9e98ddadae8ec5aaa7a9339df47e1b59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=billionaire+god+of+war+novel+free+read+online PDF link annotation
    • http://mybed.tw/uploads/files/202109141226341106.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/11952065030.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/77713487635.pdfIn PDF document text
    • http://vecsecity.info/editor_up/sogepekuvajowa.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/14260825611.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149118d28567---gunedem.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/48864591352.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/33649471148.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/70265849614.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/5c637b1a7d320322c4613d7208f73e96/sumuzajo.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/31901045397.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614538bb7061e---87037147115.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/nufarib.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202192173564805.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea53ad5625---baxisevafezenajod.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/61807883996.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/11845069645.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161425db9c1020---72736711190.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/tr5ghpcqgq2umpqg1in3fv9vk1/12332962925.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/bimoganabuvepanadojow.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/dalaxurixamumegibunarapez.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/vepenadanunuvagolawixen.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/xupirix.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/puzenemiguxelezixipiwin.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_off0000e1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 10468 bytes
SHA-256: a3643abff324f619eb14f23eb4aec688867bfd62293b937f58902f3f0bd7621f
font_02_sfnt_off00011172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11172 17780 bytes
SHA-256: f311ec810f547407e3087141eba7a50a16e0e687a14049119739e830c9785f65

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