Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbcd78937d7e2a4…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 14:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e1903c8c8e8492e32089ad17d2800311 SHA-1: 066e85cfd57729f0e464bc53d6c844d7be4e45d3 SHA-256: 8dbcd78937d7e2a479d092b5d3ccbcf5c9989503b07c47f00a76ca7392b7cd6e
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 indicated a high probability of maliciousness. The heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ti5qonu7bd42cehh9dm4hbeibl/63179679440.pdf In PDF document text
    • http://murzilka.biz/images/uploads/file/dedejezo.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/vomulosegisoguvovegofeb.pdfIn PDF document text
    • http://hongdacable.com/d/files/56725395733.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/nixawuzakaxasutixeru.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/kns5snu21f3stjp4h5n0jo5bbc/50067328118.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210904131221480.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f82d6c9916---rolododarodexupaj.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///54499438093.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/1732b5e0e726f17421233c3346fc8222/togupamukisatenasewut.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/wigepuwided.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/13555590343.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/94380709140.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b0953f1bf---lebulikukukope.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/96013091623.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/874ac7cbdb7bfb554ed1e2104daa0bc1/jobuditazuzigola.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/zokodukujikepepu.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/nowinanaja.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/50812651290.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/68680202419.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/49027061501.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/gilizemas.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/87782205070.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/92629342097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=smtp+office+365+portPDF 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_off0000da00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA00 10708 bytes
SHA-256: fcf1bccac8917627e5a25761ab863005f04c7f298e6497fdf637f41670db60dc
font_01_sfnt_off0000f2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB3 17988 bytes
SHA-256: e448026f697a27ed2d4c1b2731353c889644674c0a2419fb3f1355c761c24998

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