Malicious PDF — malware analysis report

Static analysis result for SHA-256 8213237f4b5ac6af…

MALICIOUS

PDF

140.5 KB Created: 2021-07-08 05:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: eb10a22e8f957dcb43dbb84ae8dceb95 SHA-1: 4f1c86074882725c73da875d71e7419277563bf0 SHA-256: 8213237f4b5ac6af37d315159537508eacc1e0003f5db3704886bc06cf2a30cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other potentially malicious domains. The primary goal appears to be to host and distribute further malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9807

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://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5f0be3095---35713320958.pdf In PDF document text
    • http://jaatkinson.com/userimages/jedakibotum.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607233db894c5---43438137700.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a8fdc3dbe---94440019044.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/9d06ce426e2106ab895ba6f86cf75783/mazupajifodefafurexo.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/bad61c35c0bf6d6c909778451d0aed06/dikasurogebu.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ie7gqtitph276ushp5cmojm78t/92202750721.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/uwogezusa.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/8356711826.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/57062a639cb2e7aba848e405f1782167/zifedutofilalapixepo.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa8e1eca02---38369275419.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/73045317963.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609481468885c---94640085523.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210519073008.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///87686068488.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/zemudixogi.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/fbb53f2702b4b93aa055461aee3a80ec/51123930925.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/6cce14d6eda1d77b775b0a12a1d7da84/melege.pdfIn PDF document text
    • https://securitydm.com/slicice/file/28155675899.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f9d6272ae---jibifan.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aa61efe0e5e---zikukolimetefuvusazaxeba.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ihkunpdo3imsbjjp9ojdulqi8v/39825439231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=lucifer+meaning+in+biblePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A479 22476 bytes
SHA-256: 363a8275444b26dea063999bdf1d2403d588055b61781ca1841456ef2c5af19a
font_01_sfnt_off0001dc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC01 16936 bytes
SHA-256: 528ecd6c7edb4e9ab8c96a71b19d6490d3ee703515596f8ec30e009eaa17b5e6
font_02_sfnt_off0001f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F48C 10488 bytes
SHA-256: eeedd3839193354bcd0d7dd165290376d9713166980422c8ff4cc4b63598f09f
font_03_sfnt_off00020c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20C4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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