Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc79579ad0411a8e…

MALICIOUS

PDF

62.3 KB Created: 2021-09-30 17:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d863a39df304992bc734d1dd2fa38e03 SHA-1: 411b6af7c96513eb34f88209fc4ed602f0a72ec8 SHA-256: bc79579ad0411a8e1a00b546e7094f8b880031f0f3063de4d5ecf34c9ca06595
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6508

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://myappartement.de/web/editor/files/35299239146.pdf In PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/23268365325.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/45604016279.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef1047ad1a---naneguxogibetu.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/32041664125.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/2206557268.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/bukonuzon.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/17889468794.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210926_201247.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/domaguxofojufokat.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/gusupevobi.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/339d980122dae783d63cab69f01f2fc1/pixizedezebesul.pdfIn PDF document text
    • http://hidropro.hu/upload/50355236945.pdfIn PDF document text
    • http://tabletopad.com/images/file/femanupepov.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/wanotajevaruvapawo.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/54790866843.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/xekikox.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/muvipix.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143cd956809c---51470709120.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/tibegipinudugu.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/wenumetawajagiralo.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/73453669331.pdfIn PDF document text
    • http://oilspecchem.com/files/69739573995.pdfIn PDF document text
    • http://houselandia.ru/files/44336978870.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/68277472303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=i+saw+the+devil+full+movie+online+free+english+subtitlesPDF 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_off0000b082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB082 11144 bytes
SHA-256: 06b6c01d902956670beecbc49750be3c3d2fd1495ce95f4e76d36a0ac5b86937
font_01_sfnt_off0000ca2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2A 15900 bytes
SHA-256: cf4360787617a33b4f479ad15a2da8ec60ebe42ce6b215f8dd4229d495f15cd6