Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12f5c5ab56cbcfa…

MALICIOUS

PDF

90.2 KB Created: 2021-09-15 09:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8f31d0b3a2f6a481f5d83bf96eb85b71 SHA-1: 2c9ed2c222512756e5c2fa177ef1c5cec2f845ee SHA-256: a12f5c5ab56cbcfa6521165a773bdc057d1bd101d996b21f54cadbe53a2e0358
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=top+trending+offline+games PDF link annotation
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6efa34d5c---kubejixonexulareneduv.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/12299253609.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-4/20210904061513787264.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/kirajulikaxitoz.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109121512364271.pdfIn PDF document text
    • https://mcsfood.com/images/file/befelozarudozuxewubogibag.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/newinabisota.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/bulanidibemusolaxopexu.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/kopupazataxasu.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161410fa36a3e4---3663310816.pdfIn PDF document text
    • http://vizcsap.hu/files/file/rawegedufipavuweguwete.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/42f615494873b5123530f7b914bb1218/64537654170.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/43217033804.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/vugejimagaxefafaparo.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/dilarefugepafomodoposebek.pdfIn PDF document text
    • https://cargobull.cz/res/file/5115037625.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9ab686dee---sifugotutadopowugeb.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/2oauf0qni58l3eqiv0vrk5dk18/34840639706.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/rukugefe.pdfIn PDF document text
    • http://kunbot.com/upload/files/benapeg.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/ratewimogukobisozopu.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/44795301632.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/lekekewokebovenidux.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_off0000fcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001150f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150F 17688 bytes
SHA-256: 054d9aa922ee926faa6aa44c247d24324390a49b58b5f6865416bf744fad51c5
font_02_sfnt_off000142e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E6 10804 bytes
SHA-256: ff35fd7f387e63906f2103d8079710d2dfb88d811499b044fef2efe72a9b0cb8

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