Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0439077b5fd4ea8…

MALICIOUS

PDF

79.7 KB Created: 2021-09-07 04:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 13badf493977b8e99b8be9f3f888b97d SHA-1: cadc35cb5ac8c4a8d81debd53533c467300094cd SHA-256: c0439077b5fd4ea8cc008db9be81adf43fab50c62b5421b4201f49e28b6df7ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing users to multiple websites, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, so the primary attack vector is the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://bangladeshceramicsociety.com/uploads/editor/files/mamilizeresobusomexitut.pdf In PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c02e25d5a9c---lulepabirixusaziguluf.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/vudusimiwimujova.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/jagebirumukefitilezo.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/tatajipuxorez.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/rexixew.pdfIn PDF document text
    • http://www.pilartangguh.com/file/safobotopig.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a5nfguhbj4u1l5cf2hpv0gog40/45236791980.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084390407469---kulaziwivuxen.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/temalunurasefulakida.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/30595316735.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210811032422.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/lesesiwogokunik.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8f40c788f---13003275182.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/rinaguguzonemuw.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/nemesizafidorokurixek.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7108ca035---69484081534.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/c1fceb7d912bbbc6276c0389788eb3bd/85877431795.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/14703112220.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/971ef67e781d750892e78f692b17416c/45546553798.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/7198168255.pdfIn PDF document text
    • http://soles2walk.cz/data/file/jebisetuzuzin.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d67f6b51eb---55431941364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=presonus+faderport+v2+manualPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC173 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 10856 bytes
SHA-256: f4bf7f45b2a8f2b0f062c6c4d7d6fa3512d066ea504785734821a3c4fb783a8f
font_02_sfnt_off0000f2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off0000faa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA6 20508 bytes
SHA-256: d278b593643436e0ee90a8718c2dc7e7ba2aa2a5a842103efa5ab4d09ffcded1

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