Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ee4ab707452f83b…

MALICIOUS

PDF

86.7 KB Created: 2021-07-21 03:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 949de400dd14156ce20d0a3cab87ba61 SHA-1: c017830a3315a7dec201a8ae6ea04b2b160e20d8 SHA-256: 0ee4ab707452f83be050b19efe81f0cf0a9dddf34915e25e18d42872655de088
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to compromised WordPress sites, suggesting an attempt to leverage these for hosting or redirecting to malicious content. The PDF structure and link farm behavior are consistent with techniques used to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a69e606d4---77748663284.pdf In PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/14802377243.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/mikerupewexedolijuw.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099195631abf---negiwav.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/58009387941.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/zujotif.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/mubomidasitagufelizemom.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/xapazopadi.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/51261030017.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/f66c56acc2db3b3f593517e44a7b402d/sudutetazanukidezezepurus.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/foweb.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/99f8d3c5847fe5b93d96343067b35d87/56591218401.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/33316540534.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/95e9621ea238262eb885fde2e20f574c/29208264040.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/93826352231.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/46141615692.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/65362643040.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/d5i5s8ojrbf1lsvtk6lc38a2q6/fagaluganuvidakosiwotutov.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/zujikejobupugilufexomap.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/27555845582.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/t7n9uju4cid0j4msogjok4t1v7/nubitotulasugug.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2ed2df5ebf387e51c998c70f4f86f02a/jobigirasuwugedaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=discourses+and+selected+writings+by+epictetus+free+pdfPDF 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_off0000eecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 16948 bytes
SHA-256: 7de17b60654187e62db23456c62d4109f07974dd10515bc6967958bd9c923423
font_01_sfnt_off00011b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13324 11236 bytes
SHA-256: f9ffdb3a60cf8b457d734ad8313703900780e88e3c8e78b988b3fab553a4b6b8

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