Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b417eefccd6d5cb…

MALICIOUS

PDF

85.7 KB Created: 2021-07-06 11:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7d8f094041c34d2acd422a775a73922b SHA-1: a8c5b92eb599d3938023cb55e8429fdd3c0c2b54 SHA-256: 7b417eefccd6d5cbd0fc023680e20eae737442a1332eb1d7936d21f481a88b4a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and the overall structure indicate a lure to external, potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://18554080.com/userfiles/file/17293883461.pdf In PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c256c96cbb5---81556342864.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/1873187830.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/i0qn91897vkqu9om5cobupsvs6/tifigojezevazud.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/f6ipnhc2jtotsda5ua2tdoqf52/gijujomekilipewuwudotixa.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/19966b60c766fe60056cfbf09ae63996/roxofixewurutazer.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bada1d7af16---novuju.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c32267bef38---dunekeluxavage.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae179d29d8---54400229984.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c107efb4457---nivirufikufiwuwinu.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/fe8505fe60d72768b31c5a6747150bdf/40006083103.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/rumepuronivem.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/aad360dea221c13a4edaad93a98fcc24/86243202111.pdfIn PDF document text
    • https://strechybenesov.cz/content/gogoxorezobonuwugodaveb.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609740096984f---tavuzirexogemowi.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/68843047418.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff572e0d29---38786195825.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/20/file/mamovisewizafubaxizirigar.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/51401418707.pdfIn PDF document text
    • http://vizcsap.hu/files/file/zixabivel.pdfIn PDF document text
    • http://elitvorota.ru/f/file/10114919898.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a30399f1118---89424501324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+take+a+photo+on+pcPDF 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_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001061f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061F 10232 bytes
SHA-256: e95d0f5710e38469e3510d09ae6c6e04383720e5ce52d2fb652cd8e73c96694c
font_02_sfnt_off00011d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D16 17148 bytes
SHA-256: 5c70d893f9bb63bc7fd4a6db0e07dd15a7643430430b0f0223cc6fd32f7f8c23

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