Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c92c8f0e59c3e2b…

MALICIOUS

PDF

68.7 KB Created: 2021-09-03 19:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 965c68d80481b7dadb91d6c3237ca528 SHA-1: d1c666f44a9f9cf0ba3c8b577c413632cc331bbd SHA-256: 1c92c8f0e59c3e2bd8d5a895d29d1bf2839becce2bf121e81025d0f31a594674
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. These links are likely used for phishing or to distribute further malware, aligning with the 'Spearphishing Attachment' and 'Exploitation for Client Execution' MITRE ATT&CK techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/0f5d84e26584b1a019edea4440425896/kaxidutolatikinav.pdf In PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/71c9e47fc38ee9470762fb48d4f6b390/kiloranuveduv.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/80300313856.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/71809320495.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/c633142c1c77978f5dae6791941b04b0/88116338362.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/90c674cf1574130d678ea3d2f800abee/45937397891.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/6144788157.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a95d44964c---40719913801.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/31040120261.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/77844262262.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/47772316307.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/gofibazuduzawakupakigar.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/60472348699.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/vuxagusujizezana.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af13448215---79046097589.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/4965315332.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb45a4cbe8---2292633549.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/70f8eb2550d95c66e25eb3b26c2fc529/67907557338.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d9fd6f9d11daa2cb6f0b1d5aaafece70/4116170527.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ad4273d92---13402968592.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/nuvikatofoda.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/somixavelazos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=strobe+edge+volume+1+pdfPDF 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_off0000b08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08D 10748 bytes
SHA-256: a586718ca4bd8ed5e3bc30263f9c39944bf7a26ee6bfe38181d04f23bf8ee56c
font_01_sfnt_off0000c8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10A 14616 bytes
SHA-256: 252468cc1e6673f9b936ee79ef4b3cf7f083ea035dccb3095a61678f8164c429

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