Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cac966b48697b4f…

MALICIOUS

PDF

92.2 KB Created: 2021-09-13 00:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71bd246c0fcbd777eefc126a81d96e4e SHA-1: 27ab4b4ac9ff9930be24b87baaf73fa4a9e7d82a SHA-256: 7cac966b48697b4fd6f6eb33a4b5414ee149a4d1aaaeafcfc243b3beaa1bfb90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The embedded URLs, such as https://pixomot.ru/uplcv?utm_term=kode+cheat+god+of+war+2+ps2, are likely used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://pixomot.ru/uplcv?utm_term=kode+cheat+god+of+war+2+ps2
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366654e51ac---firidipaxuzeb.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ac8cf1cca---270677471.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16130ee38c671f---berebelobaza.pdf
    • http://nbmounts.com/userfiles/file/1630740972.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6cbabc157---manafebelebezazogoxuv.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/geweposelo.pdf
    • http://dijladentalcenter-qa.com/userfiles/file/10802431633.pdf
    • https://mkontakt.pl/dat/file/78736016709.pdf
    • http://dastone.ru/userfiles/file/wiwowelajiwalufuj.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f570e63e22---bokiwafixesat.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d42db4bb76---16633588917.pdf
    • http://hangquangauto.com/files/11075031500.pdf
    • http://parilka.by/var/upload/file/12222864696.pdf
    • https://andhimazhai.com/images/files/nutojubamiraru.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d79ea1f60f---mezemijinapefagufanel.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a3bc9ebd2---7758576610.pdf
    • http://shiokuda1.com/contents/files/vikaju.pdf
    • http://tasarimak.com/ckfinder/userfiles/files/dogatukusonisafozutabef.pdf
    • https://er-cardiff.com/eurostyl/photos/file/84656504755.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c84c9686b---59634810984.pdf
    • https://apartmani-mestrovic-krk.hr/files/tazelewekamajafuja.pdf
    • http://landroverbh.com/ckfinder/userfiles/files/fukasobironubuxekuj.pdf
    • http://pentas.eu/userfiles/file/fufizoliwabitivosewovir.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2B 16792 bytes
font_01_sfnt_off0001153d.bin
a7b335d5d106c64f6c877b1f898435e4e021cd5a5b856752dbff5f287601e688
pdf-font-stream PDF embedded font (sfnt) at offset 0x1153D 19880 bytes
font_02_sfnt_off000149f7.bin
8938fdc3b9743b43b807bd46228c0023d025384d995293f2378bfb9ab27d1444
pdf-font-stream PDF embedded font (sfnt) at offset 0x149F7 10852 bytes