Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a169a9573085a1…

MALICIOUS

PDF

87.3 KB Created: 2021-07-20 10:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ce6f56423d44aa6828dae3cb1724c2de SHA-1: 0bf0d989f6a5177515d5da51504db7d37afa70c0 SHA-256: b9a169a9573085a12fe4cdf25e19d63815cc7013a0c88e86f1164163b714325f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of numerous unknown URLs further supports this, as they likely host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://mma-montessori.com/admin/ckfinder/userfiles/files/57864581096.pdf In PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e968e883ed0ba0fe935da8780091e425/puzagesekesopakusok.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/5587423642.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/8265520453.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/lefifefabipazaresup.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/1202304640.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e23b0b125f0---lorikeximamij.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/h277brjm892sdf4nn084pvduv0/15270162358.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/au5d8mkeseiicuik9b03c7dvg4/roxozusudezok.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/relokewisoji.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/f8de834167f18cfe951bb46c5a648698/sigozo.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/67827177981.pdfIn PDF document text
    • https://kawanmto.com/contents//files/12884868407.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096af67f1b72---riluruzupofuwipos.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162515001639483676246.pdfIn PDF document text
    • http://spc1962reunion.com/clients/c/c5/c535eb5d361035e84cedf1152ec4da8f/File/27571583376.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/35153ce847975db79f0d7c4cba4c1521/nuzasavirulujuwimir.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16097f619472d2---revosogototora.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608536ded8e21---buneviluguzifajolesipaxo.pdfIn PDF document text
    • http://portsreunion2021.com/clients/b/b1/b1889431de095b9710a1303a3c619afc/File/62898557692.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946d1ca2021---xivunifufagog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=things+fall+apart+characters+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 10740 bytes
SHA-256: b952798b47fb1abf2a14ad97d0c6c43410fd26689d745285e1b432c192293350
font_01_sfnt_off00010e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9C 15964 bytes
SHA-256: f001156887868d6cc2e524f3ddc381fc1b93502b7baf33397de1fb3234ca296a
font_02_sfnt_off000137cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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