Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b35d34778b862de…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 23:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cc1dfaea6bca9649aef135e95ea10cef SHA-1: 5cb808b46754aea678062773a8e31de9e1ce3974 SHA-256: 7b35d34778b862de802ff84a8011f50489b33041ec733bfcd4e45d5e49616789
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these external sites, which is a common technique for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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://klinok-saintp.ru/files/80474446554.pdf In PDF document text
    • http://michellenevinracing.com/FCKeditor/file/25408415670.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/gitetigomis.pdfIn PDF document text
    • http://metall-press.ru/files/sefapekeladexokubed.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/cfa3c062b6e6698645daa98ca0db604a/65633872996.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/4fdj4ove0e5kkj9hoq0m969f92/pawubovugusamudoraj.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/tufevibazufef.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/wufoxuxad.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/082011044180.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/8469169082.pdfIn PDF document text
    • http://zuche0551.com/upload/file/4327384415.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/46666246550.pdfIn PDF document text
    • http://rrarental.org/upload/file/tefemejon.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/rejadatoligekipu.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/6557340161.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/93684550658.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210916153922.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fc65931d5---mupinupopalozepaj.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/nononiwezaduveko.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/fudoriwiv.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/sidalod.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb279e83aa---sedux.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/20129390477.pdfIn PDF document text
    • http://poorclarescork.ie/images/davebibodubefazevi.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/70902112393.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbcfb0af11---nupumuruki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=classroom+virtual+timerPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 17888 bytes
SHA-256: 8e35e2483342ccc5295b3b0bb4e62898377278ce62d0fd71f3b562910611066e
font_02_sfnt_off00012115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12115 10364 bytes
SHA-256: 5937fba44c1b08750f85b22d48cae3d6577deab5c36a8b5d49ec6915c5787ce3

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