Malicious PDF — malware analysis report

Static analysis result for SHA-256 69c9a0c021a7a886…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 19:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 939a8c70b2da5907ad25eeecb3aa7eae SHA-1: 1fc17e88875e31bbd6d416609a5b5147a1e1c32e SHA-256: 69c9a0c021a7a886663b883fcc29f2095f4ecba7d33d8cbba45c4b9de47eca8f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for executing malicious code. It also features a link farm pointing to compromised CMS uploads and disposable hosting, indicating an attempt to obscure the final malicious destination. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely used as a phishing lure or a downloader for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://jbdclothiers.net/emailer/userfiles/file/nusogowu.pdf
    • https://cokhivietuc.com/img-vietuc/files/jorevevuxixufo.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8b5f30f49---46334593615.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/je8f4r2p6osr80dlu4ctlo0g80/17193467453.pdf
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/nokixupotejof.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/gsmfegteohvqh8koj6uofj8332/jojabekupojodosekutububud.pdf
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/9049057519.pdf
    • http://nofatrans-int.com/userfiles/file/kivulegukebexevaxojisobaz.pdf
    • https://advantagelic.com/singhania/downloads/file/40342970344.pdf
    • http://daithanhnam.com/upload/files/batunojilofovufogavok.pdf
    • http://kaizousha.com/js/upload/files/5222796297.pdf
    • http://twfbs.com/ckfinder/userfiles/files/56993786176.pdf
    • https://dewalt-naradi.cz/media/upload/editor/file/2293817822.pdf
    • http://goref.ru/files/file/14750653337.pdf
    • http://topcudental.com/img/userfiles/files/tomufu.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/pm1rt1403i3go0am0ns96anu7l/57781642954.pdf
    • http://costruzionibulagna.it/userfiles/files/60366707167.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16098d131892a6---zalaferaje.pdf
    • http://heorungminhphat.com/luutru/files/gusuwutilipoxirige.pdf
    • http://fitviewer.biz/files/file/losigubojevox.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/rbt24e7hnhptubm5aovj575etm/81253722407.pdf
    • http://autosvilar.com/uploads/ckfinder/files/64817201716.pdf
    • http://hud101.vn/webroot/img/posts/files/ruxizawotuzapagudenujumo.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/059edf16c19c426e85d059abe8feac7c/dikikazuxelafalosajoga.pdf
    • http://specimport.by/files/files/xizojolulanajowomugopav.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d703247d1---82540271491.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=advantages+and+disadvantages+of+television+pdf
    • 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_off0000e376.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE376 16792 bytes
font_01_sfnt_off0000fb88.bin
7da625934f71717800449a5c4845b32b3bfc9117ded27f05b09735a7f10200c1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB88 16552 bytes
font_02_sfnt_off00012646.bin
f4c36f9a6de2a2928c4a1acaedae82d10c78049ebf5b0fc6f7b62ce8b4777c06
pdf-font-stream PDF embedded font (sfnt) at offset 0x12646 10620 bytes