Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba9481f33fa0bfef…

MALICIOUS

PDF

75.6 KB Created: 2021-09-07 03:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69bbcc42b4ab5b0228d90e792692da73 SHA-1: 71a7254bf518e8d264b6326fbbc6d63e99be23a4 SHA-256: ba9481f33fa0bfef28a9085d07759e8ebfffa6721316583bfcd06a5efdc3ebfb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://hart-metale.pl/gimnazjum/userfiles/file/nafizuzuwub.pdf
    • https://rent-1.es/ckfinder/userfiles/files/81334468406.pdf
    • https://hizlipin.com/calisma2/files/uploads/11279316127.pdf
    • http://doer-sh.com/Uploadfiles/files/tuxagipufimododoluwidila.pdf
    • http://robalton.es/Albums/images/file///26673716593.pdf
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/nijuzutivexiv.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b03d285eb9---gifotufogawuzajemad.pdf
    • http://okna-dvere-online.cz/media/upload/upload/file/zerozukugagozumuruxugalor.pdf
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/45243563922.pdf
    • http://hiace-yoshikawa.com/js/upload/files/barilewoguselerusezujev.pdf
    • http://galaxyjewel.cn/uploadfile/files/57023866485.pdf
    • http://jjw-led.com/userfiles/file/24380649199.pdf
    • http://ahs1966.net/clients/f/f9/f93f52488d971b5f2372adc2bdb16541/File/xizepelazijitonetorib.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16126629626f47---59197157709.pdf
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/luvilexewidabaxovufuzuv.pdf
    • https://zohopin.com/calisma2/files/uploads/rarulanebiduneroxanaduba.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ab70d69644193df61655ccd0670074d4/pemev.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79c0fdfd86---gusegobuxipabomagavux.pdf
    • http://studiotecniconuti.it/userfiles/files/xexeligesusiworofof.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/09edb4c5e756944704a7eabf2e980936/ximaruvugananu.pdf
    • https://asoriofrio.org/ckfinder/userfiles/files/62246705694.pdf
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/givuxevinewup.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708ca3bdaff---rodomine.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/9d9d599dd97a84e5ef15427a7c6c4519/wukafowujumatavupomanuxi.pdf
    • http://aaaexpressheating.com/userfiles/file/bejuk.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=deductive+logic+book+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_off0000c262.bin
c7373be872221aa66db0ceca301a6f4bd7cbaf7689a23736793fd92bea5e5f69
pdf-font-stream PDF embedded font (sfnt) at offset 0xC262 10660 bytes
font_01_sfnt_off0000da7d.bin
a33ecd260e1bd4df94a99d2d5c585dc19afff373fd30de960b51275b7a995a96
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7D 17900 bytes
font_02_sfnt_off000108fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108FC 16792 bytes