Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d4c6259805a8b6…

MALICIOUS

PDF

88.0 KB Created: 2021-07-23 20:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3c6c8cb8b39d84d68c292e83c3c2e970 SHA-1: 191dd742ff376a46f49c14c744300c71fa48dfeb SHA-256: 33d4c6259805a8b6d0ca1e875201276b970b9229f76faf61ace867ce17fd2eb4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it is a link farm and a lure for password-protected archives. The document likely aims to trick users into downloading a password-protected archive, which is a common technique to evade security scans. While no scripts were directly extracted, the presence of numerous links to potentially compromised WordPress sites and other domains suggests an attempt to host and distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://davidhammerstein.org/ckfinder/userfiles/files/34626656021.pdf In PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a37bf9cbe9---rosatatiresa.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/97809392497.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/82830280551.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ada266d4d4f---togafif.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/53379514494.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/cf46bc32a291b5a5366ef76565619c0f/morekabapuzub.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a596ee1fc88---82767947164.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/2fc1667b1c61dda513d2e0a27ba81f75/98728153285.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160865ef78ad46---58669654765.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/68089681496.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/f78de12917c222d11a27054d0d1be9ad/13909874673.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7de56d1c---dajod.pdfIn PDF document text
    • http://medi-sen.com/files/files/vepexeninapow.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b54c49e89c---tesozi.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799e76e54f8---78131315839.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/1eca35f0d02c0cfcf88e8990c762f29a/sozopenojowovipul.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1ed7ba383---19202018313.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/wilipuvexiruxif.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14a0b7cc5---59860398880.pdfIn PDF document text
    • https://subarini.ro/mm/file/batovito.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/67458343cacf8b60754d3f8f5e1a98c6/63191642195.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fd9177a12---kimefebidaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+hard+reset+iphone+11+without+volume+buttonPDF 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_off0000f1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A8 17540 bytes
SHA-256: 7e2919a1b7e13b1a7ac5e80d9829711b8a94f00170130945c5716c214de32f43
font_01_sfnt_off00011ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC0 11092 bytes
SHA-256: db06f086ee2af61bb78948e57437d28f2717a00a708b73bc4867c72e1870d0da
font_02_sfnt_off0001383e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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