Malicious PDF — malware analysis report

Static analysis result for SHA-256 975890ce634a905a…

MALICIOUS

PDF

70.1 KB Created: 2021-09-06 23:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 048c75dce52601400f576e822532fe66 SHA-1: 535d48f90a1026e8c4e6190b3b8893e13e986544 SHA-256: 975890ce634a905a254010c2cb103261ca2e20c6707847d167c1181e02a8eb71
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress upload directories or disposable hosting. The ML classifier also strongly indicated maliciousness. The document body was unreadable, but the presence of numerous external links suggests an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161092b5c8f5c7---zotutefuvotifi.pdf In PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606c79bed863a---91022064840.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/kedidofiridagaxebebokuno.pdfIn PDF document text
    • http://garderoba.sk/images/_file/sitefunutowabufugoxoge.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/pafor.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/19740585044.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/79866153686.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4d08c55c288d9971a552bed4f7e90abe/60626719891.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c66737ba11c---32444644220.pdfIn PDF document text
    • http://langmypham.com/luutru/files/15945090319.pdfIn PDF document text
    • https://unicornccc.com/ckfinder/userfiles/files/70010775651.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/mafitokobisaved.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f10cfc56---timinopotu.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/f758116e71e47a61391311b779bd332b/gumixobupawijulodofu.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/1evj3tai798ro79nhirctqi9qo/83076721363.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/98947455744.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/67828411760.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/d579f45b51078a9d26fbe9aad2f26dc4/fapevoxopanomir.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/40520609802.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/moliwemerarepaxe.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0341520001620327879.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/wuwopovexijevivedel.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/likoxutozub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=acidic+foods+chart+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_off0000b5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EB 14912 bytes
SHA-256: ba636b137c175234400ccb433ade5c553aed7425b42f9245f6f4813fa97c0908
font_01_sfnt_off0000db02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB02 10416 bytes
SHA-256: c39513a5f76963fb6b1c1e8c9d2a24a4faf9bda00047e16f2d4609a68f1d41cf
font_02_sfnt_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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