Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc66fe662fc40c3d…

MALICIOUS

PDF

95.8 KB Created: 2021-06-27 20:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7ed2da2023be7221d2629365d5a51a80 SHA-1: 3b1ad1bb5c4a7e56e0e364c12e1816c592643dd0 SHA-256: dc66fe662fc40c3d2660c6f8233f9c3b2d0093c79592b7c6de21f8406b84afd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting it's used for phishing or to distribute further malware. The PDF structure and embedded links indicate a tactic to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://chromowane.com/userfiles/file/mugaxuxuxunogabopisulasez.pdf In PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/f074dd502e083b646563cedd95f88277/70086607929.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/95a96ei89r8sa3bum2e4o2qtnc/nedejejinawolikabadeno.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084729f90d33---71832666085.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/23686206389.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/8880014491.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/sl71enssedcecavb7nmsppeib6/40303378755.pdfIn PDF document text
    • https://master-service.ro/images/file/54751868189.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/medivod.pdfIn PDF document text
    • http://cga82.com/admin/File/96727815962.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2cb589b43---26453059916.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/70352803781.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba2c9542be---8845611499.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/84qm3bj8iv2cohlv1vokkjng89/22175635412.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/344taec1k7496b59ldnsf03p7m/surajojamelulaxodimi.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/zesufidebunuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=bell+hooks+the+will+to+change+pdf+downloadPDF 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_off000113c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD3 17332 bytes
SHA-256: bcb658c67a32938633e495ec6d94316aaf192dcab093e469994eb3db9650f58f
font_02_sfnt_off00015918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15918 11028 bytes
SHA-256: 6d1f97338abf7e601c63f686d3042b9f3ac62d350420e902ff5d92971d269060