Malicious PDF — malware analysis report

Static analysis result for SHA-256 e69aea5976e8f127…

MALICIOUS

PDF

80.0 KB Created: 2021-08-28 20:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0fd73ff635a83ab9deb61fb394c96c8f SHA-1: 3bbd6bece2aa3d3f062b9be3ba548d84d2a0631a SHA-256: e69aea5976e8f1274714b97b5cc8654995390a5ae611fa63cff000e0b73c6b36
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, forming a link farm. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate the redirection to further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kondicionery-fryazino.ru/upload_picture/file/bebiz.pdf
    • https://serpavenger.com/ckfinder/userfiles/files/47749649009.pdf
    • https://elsa-daulte.com/ckfinder/userfiles/files/fogoz.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b86a896b2a---90751793444.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/56bd9o5knldcu3lfpbmoffbe9m/91100564154.pdf
    • https://ladachess.ru/userfiles/file/luzofopiteniki.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789ef2dcc7e---tadelakerimepawinedo.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a996f4a64af---ritefidozuporujozavigoro.pdf
    • http://www.awakohchang.com/image/upload/File/7748052469.pdf
    • http://dgjst.com/upfile/file/59925379941.pdf
    • https://netiko.ge/img/Data/file/52405215656.pdf
    • http://www.anclupnapoli.it/userfiles/file/99373609765.pdf
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/tesonuximugipinubiko.pdf
    • http://aelma.com/sites/default/userfiles/file/sakexikugerajipapino.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef1f964fa3---47063085271.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16119dc5decb87---jovomojaketomix.pdf
    • http://zpb-maciejewski.pl/upload/fck/file/29888830729.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/9hf4iv2eb8jigj1k1ndu92ge9j/52277881795.pdf
    • https://rtvpuls.com/ckfinder/userfiles/files/nokemomivikiriti.pdf
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/f8929e0dfee5dc1f5db849a8ab58214f/69225207710.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/4b0hqa7spugmp9cdd0v693o8f3/bobapojerajidufesuw.pdf
    • https://ubk-sad.de/azubi/userfiles/files/gilajakavu.pdf
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/36737831465.pdf
    • http://j-club.eu/userfiles/file/gawosovadaxaxusamomen.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/rcdcb6k3gadlrdfmj1b62e4ri3/wesumagevoratike.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=algorithm+questions+and+answers+for+beginners
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off0000d7e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E3 16792 bytes
font_01_sfnt_off0000eff5.bin
c8c859bbc06509f6ca164eb285e2651da71f1717629ef1d44b2015a4b5ecd850
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 17620 bytes
font_02_sfnt_off00011db3.bin
ad1cf93dcc1813c89073c818dd62e3efc709601fe03b45da2be6b1fef2edd846
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB3 11252 bytes