Malicious PDF — malware analysis report

Static analysis result for SHA-256 3775ac7a342c8dda…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 13:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 03ab570f322ff13d60d047ec96979dc4 SHA-1: 1cb5401b33731814407c8b784ac72a80a9e02209 SHA-256: 3775ac7a342c8ddae5c41c205b7b16c6221fc7af06eb4241e4b97f2d2d4e6b27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//50020224667.pdf In PDF document text
    • http://e-park.es/img/uploads/files/fubozavidev.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720e0972ff8---17468622874.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/pc26d006evksguk2m9m69jboj2/36848894013.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f7db36bf2---59316812097.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/tiwinibipaxod.pdfIn PDF document text
    • http://hsiwww.com/image/files/20210801_041825.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/47316071966.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/70369606730.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/65666477528.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/kanejedatudi.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/resusuwokipixotivumep.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c972f72b10---20927087737.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/360kjeq6ib5ntg0j0mikkuk2ks/tipoxavebemisubosebef.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf963819576---bimurusodaxefuwegixipap.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/mafiwumuvat.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/28ef564958d05fe2ebc13d8ab804a86f/mupibesizikekider.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/nulaniruzizabuturujomu.pdfIn PDF document text
    • http://aweibel.com/Photo/file/12609667932.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae1fb9d08---bezaw.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/118b9c3f860ad25ea2cbdb4ebe9e2798/mikawu.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ade5f2612---4450527974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=data+administrators+are+responsible+forPDF 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_off0000e3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A9 17312 bytes
SHA-256: fa4ff41043422c0b3a6ce9e67f7b91fa4de1c6602602e8e6fcdfb0ed8ab6fc0d
font_01_sfnt_off00011110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12927 10800 bytes
SHA-256: 51a844b5ef9e3275a7854c1c9a813be05d84abeb0a8f45e45e87952f2fe4f669

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