Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c0b119232a5b54…

MALICIOUS

PDF

72.9 KB Created: 2021-09-05 16:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fd20db30ddde0c6b0855f8c7ba25b005 SHA-1: 9cdf626ccca83974dd24714ba031a18f4197991b SHA-256: f5c0b119232a5b54ebaef2a492ed05302862b8cac3c2eef5627f991bcb0be5bf
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, pointing to multiple URLs hosted on potentially compromised WordPress sites or disposable domains. These factors, combined with ML and ClamAV detections, strongly indicate a malicious intent, likely to phish credentials or deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9283

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://ahcxdq.com/uploads/file/030914066850.pdf In PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b89ce26f997---80219369766.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/c04a911d65f40ae6f1f333a90650929d/zazodimujazasiwire.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/xiragefujon.pdfIn PDF document text
    • http://flexa.cz/docs/file/46764584523.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/rujoxefesajejite.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/e0h266pfusaa61e0jdokqeei3g/14311296735.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/25445362213.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/12812513903.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/91434057009.pdfIn PDF document text
    • http://le383.com/uploads/files/94392873258.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/8521317791.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/degenujozuxolidotirevujel.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/25970229447.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/goxaxixomoki.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cd829c1ba0d---jilukimomapudo.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/2342142039.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c396d705c63---dulope.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae589cdb22f---xewazitarevifiwerujuxitex.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/7b3eaca4cc6f2435a4838e4a7aa706db/mezelane.pdfIn PDF document text
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/31274110904.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/256508ef623ce22fb957e36819024254/6690434008.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/10361190785.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e01e2d18fac---32506118770.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/vebirupozuxaterexeladufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=synthesizing+worksheets+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46F 10996 bytes
SHA-256: 671addc06ae6e046512b45bfabbeb6f39218d803a05f6d3fcd1a1cd4020665ca
font_01_sfnt_off0000fdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 17132 bytes
SHA-256: 8309c30e1257b658c64e5f87a8d6d96cf06976f8193e4574898845f7d43b3635