Malicious PDF — malware analysis report

Static analysis result for SHA-256 134175ca66c7b03e…

MALICIOUS

PDF

93.4 KB Created: 2021-07-03 00:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 025786dc4b01bcfee414083dc341793b SHA-1: 5b6dce86585022ab38c28630dc703cb336b2a566 SHA-256: 134175ca66c7b03eb019bd7fae08c009d8d69b581e371ef6c169924446f04ecb
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised websites, likely to lure users into downloading further malicious content or visiting phishing pages. The presence of multiple links on disposable or compromised hosting reinforces this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c075042af53f9e22d2663accd1e5159f/59980777101.pdf In PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607158f7dd3ef---dupinarexojanevobe.pdfIn PDF document text
    • https://tl-systems.hu/files/files/67677896318.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf5dd3b08b---tolejelerujofalapi.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/pjcn7dbcd31a5qs5rqf4retkb7/43585486525.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/8pttn9d737ll9uvjk9a2dceuc2/jemoti.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92557267004.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861b2517aba---tivonipiweriluwadige.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071ef9810934---83870841017.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/mubotoferapav.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/pofowovubanepezilerix.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/2a3702d44198ed0c5e4cd9c1bf463772/zulugila.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080053f42ffa---55938241643.pdfIn PDF document text
    • http://ibb-online.ru/f/file/19567968134.pdfIn PDF document text
    • http://babamoleskine.com/files/file/21373925554.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/400e939ba31a070946d1d6f3450a8b08/94726539636.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd24656183---mukavemo.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/revepi.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/guufn8j9bhhvr1r5vm88uf311n/16290295729.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8a53a61bf---84559162663.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21eaedc36d---56183296071.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/43d9f48ee03fe6a871867311185bf723/8660697746.pdfIn PDF document text
    • https://bio86.net/fichiers/migawugibuvekukup.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/rokogoxizujirifarovuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=scientist+clone+human+embryos+to+make+stem+cellsPDF 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_off00010275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10275 20312 bytes
SHA-256: 0c7c15b8037c22b2b9dc2186726fc2679335ecb160cb95126f164ab70eaab94f
font_01_sfnt_off00013679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13679 11016 bytes
SHA-256: 53df68db945967e9340f6b01334c00386bfdbcea073f8adf909dbbb53e1568cb
font_02_sfnt_off00014fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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