Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6750110e7ea6e5d…

MALICIOUS

PDF

68.1 KB Created: 2021-09-19 18:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed47f8936e9abaffb87ce33e4aa07ed9 SHA-1: 91df651729582bab9772cb59b2b4a0cd7aa74d16 SHA-256: d6750110e7ea6e5dfb9bc8a67d1f7210b75ea7bae728ef9e75aaad5e08fd6174
176 Risk Score

Malware Insights

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

The PDF employs an image-only lure, a common tactic for phishing, to trick users into clicking on embedded links. The heuristics indicate a link farm structure, with multiple URLs pointing to potentially compromised CMS uploads or disposable hosting, suggesting a redirection chain to malicious content. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://snsi.jp/image/news_file/37962353759.pdf In PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140eac04747f---48519126188.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/17227927937.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/36784152985.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/mejejaworunasusepodujo.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/juwededavopuje.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a97bc4ae995beef77531d6f640ccbdca/35672419249.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/55256400826.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/80993807231.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/76904751363.pdfIn PDF document text
    • https://italvaping.com/file/99144392746.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/42416659876.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/367247454cab6525aed73a3fbd3bd91b/38829161320.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/64762169954.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/25970034469.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/13154599109.pdfIn PDF document text
    • http://aweibel.com/Photo/file/misil.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/68096957055.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/tadomexipibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=free+download+bully+for+androidPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/jazivinikerederagamef.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_off0000af1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72C 14288 bytes
SHA-256: 101710f722ae6c503fc0dac59765376d67c378e0862281a83c645abb12182ff9
font_02_sfnt_off0000eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 10500 bytes
SHA-256: b6cc21255622739748a655b8ad5885f84a18f14835c638d55cdb1a92674a56f3

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