Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb0352f7da42188…

MALICIOUS

PDF

77.3 KB Created: 2021-08-27 21:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d3837b4b07ec5babf45bc0b6bc5157b3 SHA-1: 86a57490280f80fffffce7eaacd546b096a0eded SHA-256: 9bb0352f7da4218870be9c733024ef6767c493e02b9cfd5b6ceee41f6ac931f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on disposable domains or potentially compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely a deceptive lure, such as a fake invoice, to encourage clicks. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://amsaneeraus.fi/userfiles/files/gikomerubisosumilawor.pdf In PDF document text
    • http://madonnina.info/userfiles/files/46857177968.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf397a34c0---goluj.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/11653560388.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8d1ab671df7f168e191f4bb5a5cb4f29/38151461898.pdfIn PDF document text
    • http://zkpower.net/upload/files/jobopixekivedibebow.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/xejodu.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/vetomiserevorobapufalowe.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/gekajexovezanowadi.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/53711816009.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16103d9a72319a---8019176865.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4c8bfb0c373144c2e1827958a06f2363/xuxuxobedojivupel.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/37475731056.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094a63691ad9---48420052515.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/6b5300176db6f4438e9dc03d035d97bc/42424714385.pdfIn PDF document text
    • http://jfe.hk/userfiles/24686367846.pdfIn PDF document text
    • http://www.centralperdana.com/file/fivibonerulojedijefebula.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/rujodogipopetuzu.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/ac54d880aea301ff4c23e487f52e5ac5/xasatejobeja.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa93dc3a2af---gonopumufitozidibufike.pdfIn PDF document text
    • https://samavetah.com/ckfinder/userfiles/files/69332174429.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/fimutale.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/5nhpi6fqiebrmk6v8ch7qdeqc5/44577616954.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/i8do8b7g6htqnnnntc4l1nnm43/tuvodivofap.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f79463e1108---daratoxuzubaxinaladom.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/ferefapej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cuyahoga+county+prevailing+wage+ratesPDF 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_off0000caee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEE 16296 bytes
SHA-256: ec4dd25757c4d3c032393f57538eeba6c0d93ffd0252ae67f0cb6cc5b026271e
font_01_sfnt_off0000f445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF445 11052 bytes
SHA-256: 27641905e4126ca23fdf4e9449f541023c688e3d03d3d6453beb4640e2ed421b
font_02_sfnt_off00010e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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