Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19e49e996edd5a2…

MALICIOUS

PDF

69.6 KB Created: 2021-09-19 05:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7cee5a8f4c1921dc868e34ce7bf25a3 SHA-1: 7593458b00ef0afa8d41d067119fcf8f1537f3f5 SHA-256: e19e49e996edd5a2fd48db52e4c9fe9e9bd7ffdc7b303c723487554135463223
164 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. Heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress upload storage and disposable hosting sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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
  • 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://ymmicro.com/files/files/13502501652.pdf
    • http://crestviewshopping.abwingsmd.com/uploads/files/disalajelalajixi.pdf
    • http://csc-021.com/userfiles/file/20210911094907_gvwoxp.pdf
    • https://ecoquimica.cl/dinamicos/uploads/file/36947310655.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/jisuzozopamuno.pdf
    • http://melabo.com/upload/files/11469913780.pdf
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/lapare.pdf
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/20045571902.pdf
    • http://webinaris.eu/ckfinder/userfiles/publics/files/vugokava.pdf
    • http://proreferee.ru/uploads/ckfinder/files/22078454239.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/aed8d416ca40e90906400f41ddfda205/57873972513.pdf
    • http://fsnmmaterials.com/UPFILE/userfiles/files/13787262706.pdf
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/74089157138.pdf
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/84913720773.pdf
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/96735416137.pdf
    • http://imdad-egypt.com/userfiles/file/98347768718.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/14e17101ec91a8e55158103072514330/dunipafagaf.pdf
    • http://zulassungsservice4you.de/bilder/file/71918473880.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405c1d6dcff---76643840315.pdf
    • https://acrgroup.nl/userfiles/file/kuludelijajonone.pdf
    • https://adurucui.com/ckfinder/files/24401453593.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=receive+incoming+calls+android
    • 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_off0000b3cc.bin
16a342803c2ae0451a64f9f7ee7f4117ce839ab37ac3f2bb9e7b0dc94febe74c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CC 14612 bytes
font_01_sfnt_off0000d868.bin
21626604bb926dfd39a70c62f0ced69f373326538e304e2523d129bc1bbbb9cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xD868 10728 bytes
font_02_sfnt_off0000f0cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 16792 bytes