Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf929281ed01bcaa…

MALICIOUS

PDF

77.1 KB Created: 2021-09-07 06:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 165868f17e496c19d1d136404ee96bd0 SHA-1: 42696f411c7529554623b1a899b2e65a0edfc2f7 SHA-256: bf929281ed01bcaae22277f4bd97ac0d3e299c69cff43fecf453e060ae29e51d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm intended to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/3c7def22fad2143d846bcd8c62bc7a89/vumiwaluxoxisojafixil.pdf In PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/98570424267.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ead444b15b---zikebalikoletiwurivones.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/mejobepabijejejetanam.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/xokirow.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084a43ee6820---nufitu.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/81423623110.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/5372410677.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/dafenozinenuzokapakidiku.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/fazokakirimudasidawebawe.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/89551787016.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e13f2a516f---pokawati.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/dekumugixexijukepojiz.pdfIn PDF document text
    • http://newmob.it/userfiles/files/zegojizabadodovet.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/92343647088.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/84695787268.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf99d0230c1---milidifaxedepilubife.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/furemekitisolerubu.pdfIn PDF document text
    • http://szcftz.com/upload/40044384904.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/tawajodumumotebufidexura.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607863caa9bf3---nolorabikubozed.pdfIn PDF document text
    • http://findplusltd.com/file/89431900530.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/19251767585.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/41569958670.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092385dcdbfd---kiwewonuwenemoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=convert+pdf+to+editable+word+on+macPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67C 18104 bytes
SHA-256: bf1470996cf844116af15eb786f18e190510e6ede39e952536fe7543d0525672
font_01_sfnt_off0000f57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D94 10936 bytes
SHA-256: 922657e331b8236c9197d40f4e3a67eb232eb2e67e4a031218ca5615ddfd7ccd

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