Malicious PDF — malware analysis report

Static analysis result for SHA-256 573804aa528ebfcc…

MALICIOUS

PDF

90.8 KB Created: 2021-08-14 13:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5cf4c8159fb0adf11d7dbcac2552a283 SHA-1: b26e8a59c7d37c2cac1f4e18b92f84388d2cafab SHA-256: 573804aa528ebfcc9d97b31d6dd938e457f0267e27ec9931938b36f10d3d5620
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised CMS upload directories and disposable hosting sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ebc9e224a---43072639316.pdf
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/98266998287.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88b77f062a---fimoforivonazoxoguwo.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/426f1c4366cbc0aee5d5c4e0969720f0/tinikomosixefeletu.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/o1d1ig1110jntg9966i330563d/femogegi.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082636fa347e---28726873781.pdf
    • https://poolpoint.be/uploads/file/bazuduze.pdf
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/39945936420.pdf
    • http://arisutour.com/ckupload/files/74206302152.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f51a0d4da3---bowisirawidudok.pdf
    • http://suamayin.biz/userfiles/file/83273501166.pdf
    • http://ahchala.com/img/file/50864901724.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/afed44cc89adb83a6ff8f164eb64f025/6426120626.pdf
    • https://tkquiz.com/userfiles/file/1711563381.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/eo0mhdqvtv216fkpjahi8rf72l/55064942155.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098aea4cd2d2---71142415045.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b68c3dffa---zomonapezaforerizuvifolod.pdf
    • https://home-consult.lu/userfiles/files/86708511111.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/nafapomupur.pdf
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/jozuxon.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f737aea171---xepigodotevikujira.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+the+meaning+of+speech+act+theory
    • 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_off0000fdd6.bin
8c32fa0066d752ee6e52380ccd858b65640dd5d98c7640d5f89a66a47e8390f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD6 10988 bytes
font_01_sfnt_off00011745.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11745 16792 bytes
font_02_sfnt_off00012f57.bin
f20ac6c4b98081980194d3dae76ba0c2996a443dcb84e9cfd68c607917aa11ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F57 17616 bytes