Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd3f3d8534ffe9c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 17:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec8f9f73633176f238dad03e44f4e4a7 SHA-1: 0c3ae4018d358939874240e55760acbf1c355715 SHA-256: 6bd3f3d8534ffe9c1d2de2f6ed42b0eac404bf8e71610d35378eea18671e1d0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with attempts to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://coretry.ru/uplcv?utm_term=general+prayers+of+the+faithful PDF link annotation
    • https://pharmawell.eu/ckfinder/userfiles/files/12658613584.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2796441405.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/51179578503.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/17034677663.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/fepusalafaw.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/6182174065.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161337c63a6c42---petuvowipatalasidupite.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cf2980605---36322205338.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/48971937180.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/kujojererumogusidoluva.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/72904801571.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381c92f3b15---97286488239.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/xineg.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/24583964905.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/lonagozokudididok.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/54035664053.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/zidixezoted.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/94257029548.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/febizewub.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135e672bdfb6---86149258583.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/52484517875.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139d5b7da822---zezajiralakuwulisekadij.pdfIn PDF document text
    • https://timminsrenovations.ca/file/SkiXb5Aq3wsin1pI.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_off0000d8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A8 17256 bytes
SHA-256: 1c21ade34ea12503940a7301327a5c4d20bfeac91a7e458c1b5b77c33c1fce15
font_01_sfnt_off000104e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFE 10708 bytes
SHA-256: e24f1c157eb1d14360d4160d3e91e163e45f638e318928a3f7b15c43fa5b32a0

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