Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b6756a3cb087295…

MALICIOUS

PDF

164.8 KB Created: 2021-07-22 21:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7c28714509003238f1bfda5c37189eff SHA-1: 45f1960f6cb0c111e6678f10be7316641b11bc5d SHA-256: 1b6756a3cb0872950e9bb98add5d6ecb26f0dae5454bc940a985bf803e982c13
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress sites. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5017

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://longbienco.com/js/ckfinder/userfiles/files/mubiz.pdf In PDF document text
    • http://ohappy.org/userData/board/file/16272652703.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/12959758201.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/9225453493.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607eee265322c---48212671317.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/42cec24703937730c727b72bf09e711b/jazasojugiratejiwu.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/fuxaxojifirefo.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/95568067646.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/nofozixun.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/4626a2f456267a4dfd5f29daa0ab9300/12755626504.pdfIn PDF document text
    • http://01host.ru/userfiles/files/71227535012.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/fodevavazoza.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/butopunopi.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837fdef393d---38170161409.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbc87eeb16---60658700324.pdfIn PDF document text
    • http://15889163.com/ckupload/files/13567303372.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/75824447934.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b305f15bf27---bakimutejigezaraxizozus.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/ae2f2b86d5907d2557676a749279c49f/82727552357.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5fe789622---tugofog.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/66487901575.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/68a5baae511e9afbf25700da96eb5a47/59875394610.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/59855814507.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/wupawapazinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=legal+maxims+for+judiciaryPDF 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_off00023f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23F22 11020 bytes
SHA-256: 020a2d50d2280d632fa050488db5d5c5ff862d7dbbef947045365cc7115d6428
font_01_sfnt_off00025890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1