Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9703c87c3295ff8…

MALICIOUS

PDF

78.1 KB Created: 2021-08-16 02:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 368097ec4068776dbea19b7fb2bb2209 SHA-1: 73bdec6103ae95d769e3a638c3cbca01746aa728 SHA-256: e9703c87c3295ff8f537eb3c1d84bd4bab5a4827a5d50367ec7dc228194f6a43
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing attempts. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an effort to manipulate search engine results and attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b17046659d4---50703412983.pdf In PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/2ee2b206a79d88d0093c8df63d1637f9/xivekumovajisogadebeta.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/1fdme6ghb0b74s2vcodmsmcmt7/59953366325.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be1b60b8f94---kajusuke.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/depomulejesorazazoxaje.pdfIn PDF document text
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/3348934788.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/42087464559.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/44136215637.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/fabaripopozifiwovinikokuz.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd324208be---serezeg.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/fatepenujigudodivomez.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/1b7ff6f228c5a8d9e9a6de11acbacea1/19400999884.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/rukovorebozozoruga.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/1pcrb0255715b6cjkrb2bltnsl/11860797185.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/wexut.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe14e1c108---pugarexofi.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/0brops4tq0b6ns6kom9om51fib/bukoxajetigu.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/33854049854.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806c3ae5d71---rozipuvagupedisafar.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/84308002593.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/632ff243d0061f5576b3faaa6d88c217/ruzutulonadixezifi.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd9fb27085---mavafalovuteresobix.pdfIn PDF document text
    • http://jump360.co/upload/files/20210809192049.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/75204345630.pdfIn PDF document text
    • http://sibservis.com/ckfinder/userfiles/files/52560873276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=libro+de+ciencias+naturales+tercer+grado+primaria+pdf+2020PDF 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_off0000c882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC882 17620 bytes
SHA-256: 985c2834d5f3fa429617e6d758c55dbbedde5aa601b49e0af44896f2a021fa3f
font_01_sfnt_off0000f528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3F 11404 bytes
SHA-256: 8daefddd6a00a4a5f93b8c28320628a9658f51886ff6a9144ba1e9bfa80c0c1d