Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb5fb899b474fe7…

MALICIOUS

PDF

74.3 KB Created: 2021-09-16 04:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ef51cc82764eeae6f5cf3fb77925130 SHA-1: ba7210a6f2cb83dc67f1d064f9f6c498fc539c12 SHA-256: 7fb5fb899b474fe7c43512626027614fd35d047291f031caad0e36b80b92de1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://wastran.ru/uplcv?utm_term=standard+equation+of+parabola+with+vertex+at+the+origin PDF link annotation
    • http://antasboru.com/guvennet/resimlerfiles/74629326441.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/35qj33norkcetrl3qaa3d4kvm5/33130084839.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/31244468334.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/judasopoxiluw.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/jijetug.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/dujomiw.pdfIn PDF document text
    • https://makenie.com/upload/files/saxelusa.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/71073539720.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/xarudataw.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613207df04b7c---sofawifuwenokefi.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/78368416641.pdfIn PDF document text
    • https://highrise.pl/file/meruvitu.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210912071901.pdfIn PDF document text
    • https://manenshop.com/upload/files/70525308177.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/sejoda.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16142278e4a9af---jopisov.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161373a5d21fec---xodegumutakejudok.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/dafevomi.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/23863481560.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///16042371317.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/jexenulu.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/xuduka.pdfIn PDF document text
    • http://regmac.net/userfiles/files/24455136713.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/zologifakokupe.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/detafosapaxuvosifujodoli.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408d1a002c3---5801078683.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_off0000be63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67A 11324 bytes
SHA-256: 6b3ff8e51dc8e4187e3290a3c4ed9a8d4dc46d8fc503dafdf1640c94ef5eb458
font_02_sfnt_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 16564 bytes
SHA-256: b29e613284e311c2862d83f209630b1354b1bb528cdb4725cd5e723abbfbe866

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