Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ea3f6ec63fb401…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 04:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 94d83a8a90365968a475ac7cef7d0c25 SHA-1: eb7373bee7a555154a22b95cc165524c30e0e6d1 SHA-256: f4ea3f6ec63fb4011e9df795fcc7e22355f2c3eb8fc07c973d77a9b9089757ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with high confidence. It contains embedded JavaScript and a significant number of external URIs, many of which point to potentially compromised WordPress sites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4ba069992---luwozimonuwadat.pdf In PDF document text
    • http://remaining-mc.de/userfiles/file/gemux.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/12074084779.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/bulibijaf.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/40080690318.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/ae7e4dcfd02013b67da1bcc950e4ab50/61872068977.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/39436554221.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/84165624746.pdfIn PDF document text
    • https://starbox.fr/img/files/91771419785.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/32711584883.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/kebajulati.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607518ef07439---fimavaxeseluwo.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/46738285777.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/tasimolazagelofa.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/e782d7553a531d1f42e66c8caa659cbf/78672701255.pdfIn PDF document text
    • http://vit-physio.de/file/97686350410.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609745762474c---50533835176.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72fc97699e---xinulijotiz.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/eee8cfd6358572715e06aded5ea9d94d/maxakavafemerasometisan.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/21440743570.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/5a20e71e96cfecee676c0f16309c5fcd/jikobujapewajobanovimi.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/854ec4229da0da75ad2093b560146f46/60909286916.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/wurojesagurabupifu.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/83646586303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=lalitha+trishati+pdf+englishPDF 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_off0000d2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 17052 bytes
SHA-256: 3287ce77a518a28285b905abcf8e8c70bfe79efbd12e0539088ae218405c1c9a
font_02_sfnt_off00011775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11775 10616 bytes
SHA-256: 05250be28740d08f798170ec768bdf5880a6f2b35078581166a3bde62c06524a

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