Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f51c25841870a2…

MALICIOUS

PDF

82.8 KB Created: 2021-09-03 09:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 508099a4442e1b5316a25ec7fb5fac80 SHA-1: dbfce16861926d8da181915fe21726e65314c1aa SHA-256: 46f51c25841870a2d54c9d3d0710ec6e22dad48cb526bf843faa2558630204b9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing form upload plugins. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection. The embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the document's purpose as a link farm designed to distribute traffic to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073162d3a0bd---direbimopode.pdf In PDF document text
    • http://ytbozhuo.com/upload/file/230536129464.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90717bba6---96168703163.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/710f5a97d336ebb4fe675e87c584ccbc/56874604409.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29391070680.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/3d5b5bfadc830045c5d0d1b87e4bc9d1/55668044126.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/27740670606.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d2358dd8c99---16379569897.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ea2cd60df59819c747d0d00fa1f84f52/92948623039.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/e6f4b3b06c7e44bfe69567681e57a47b/zuxatefolop.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///gigikoxifavawumerufono.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c76f3b9f0d---10059881694.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f113ac2269---56438733611.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/fiberi.pdfIn PDF document text
    • https://cmoretv.com/userfiles/93777813386.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/9760782521.pdfIn PDF document text
    • https://yellowstonewildlife.com/nedotalujofeginex.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/naxinituwugu.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/86252278038.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/21480947261.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/79916482246.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/teleduboxebutaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=fasal+panjiyan+form+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839a9a39c40---faxizomigesatatepubi.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_off0000d193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD193 10652 bytes
SHA-256: e9017663e968e8ccd3e242aa0640097fe9daa9b713076ba6bd47a71b77cf769f
font_01_sfnt_off0000e9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 23524 bytes
SHA-256: a204df61562b2d2f7021e65e09c84851fa8762e6d312e017a8d16abbda848019

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