Malicious PDF — malware analysis report

Static analysis result for SHA-256 af53e19ee1bb30c9…

MALICIOUS

PDF

86.5 KB Created: 2021-08-01 01:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c0b609c73e5bec15202cde910ca30594 SHA-1: 36ce92bc0e3f558bfbc2194cce7a5fb1869163af SHA-256: af53e19ee1bb30c9289f1f4d3444e37b12522a8e10ddfb3134b755614eb5e31b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate that this document is intended to lead users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b020a5cba51---76911503791.pdf In PDF document text
    • http://sskj.pl/userfiles/file/sumipanatevunirom.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/manidifopumimulom.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210630002241.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/32314997002.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/78888771045.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/50625976396.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96e64989e1---milumupag.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/fatebok.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ab314379f---65431661077.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607971714f5b2---gibafalisolutebuxafajuf.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb7d170040---93327256437.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/d9e1e47f4b38a3e07e18e6dbf687459f/91888638923.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/rezubomiwe.pdfIn PDF document text
    • https://songhong.info/userfiles/file/66671532093.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/vejusasapepazifawo.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/2095259707.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073155045511---50216010102.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/d4gr7r2vej7vsferhdsau820pj/laxiwaraxusi.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b2874441c---xujoxususumevivuwudatub.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082a2a406df8---turexetaziwoxonete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=como+recuperar+um+arquivo+pdf+corrompidoPDF 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_off0000eac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 10708 bytes
SHA-256: 260f89e60aeda30c8b6c750b82e34a68fa0b25943ae55fd61fe918bef4a475ce
font_01_sfnt_off0001032f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B41 18540 bytes
SHA-256: 70f519947635a0c4a9568694c7b267ffa429ae4ad6f798266d447f66463981b5

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