Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36b096dc267d773…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 04:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 573c22e83d9fa9b94b3b6811eb4b96e7 SHA-1: 69e21df7299d681869da1461bbfaed7ce0a9d767 SHA-256: a36b096dc267d7736e2c6d86b8a35d72ba061f53d88393e23cdd1686aa7f7fb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, not containing user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=manuali+moto+honda PDF link annotation
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608552f57a430---55142653314.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/xasuselo.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/5180850097.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161236d96d3965---2156467057.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/79769253976.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2c2abaeea---49453894022.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/26730041854.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/wizotesomiluvukodana.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/27313011159.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/busume.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/e58f504472a858899e08b22f467b3221/32955876105.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ffb48e54b---saner.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9a577ce4a---befaxipajamarup.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/d59d0c95ad6938f3f5d40d05e0d1c4ed/40649890177.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c83a2215a78196fcd976992f24293254/21865884967.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160898dd9be8cd---25952794666.pdfIn PDF document text
    • https://kaisar168.com/contents/files/13996120277.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/41b8bfeebe2da4d595097b9f84e9a919/botebuwilir.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/979300256.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/56451231859.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/86246621844.pdfIn PDF document text
    • http://nlureunion.com/clients/33063/File/kodipuwivajerebasepegov.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae6ca3f4c0---52828239911.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/pasasegojolasasekizexemim.pdfIn PDF document text
    • 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_off0000dbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 10204 bytes
SHA-256: 50ddd29dc7913ecfa5e6618383f407dd24ba82aaabb1225e2a948d164755a9cb
font_02_sfnt_off00010a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8E 17544 bytes
SHA-256: b96422f1f9aa040ddb8060a5411eb497b9e07cb06ea9a114db30c187423a2cda

Open this report in the interactive analyzer, or submit your own file for analysis.