Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf3ed94a3dfd87e…

MALICIOUS

PDF

89.2 KB Created: 2021-08-17 06:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 718289e1696ac3218d0e9f2d1ccb5d6e SHA-1: 5c4ac8c28b8c6060601e43069e14fa8f50b07397 SHA-256: ddf3ed94a3dfd87e44f8b947764b97b7d73816784443dc759f8634c570b5a362
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing campaign. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://krisoc.ru/uplcv?utm_term=printable+healthy+and+unhealthy+food+worksheet+pdf PDF link annotation
    • http://autohondl.cz/userfiles/file/fetol.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/64593980282.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/add7a65bd065b137690e321e4e636cf9/46365959495.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/80b1d5e642a63d5b29867ab68117bc95/labukakuwukifijakutidazed.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/lalegojejaxozamal.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/3d77430936036068f99c1913d88555c4/54005853591.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/kebol.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22eba12dd0---sorojepixugirebamigubaka.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/87717664341.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/5bfd9f50395b150de289d67dc47e6a43/44843104533.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/63502255672.pdfIn PDF document text
    • http://beateromer.com/bilder/file/bepusedexevobivite.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68714a1f1---dajowoxozusofogimutonu.pdfIn PDF document text
    • https://dm288.com/slicice/file/75704937451.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/327b6fcb23a840c72a46c07c6c16a1ab/wemepidaruradir.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210611152928144.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/53523344704.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/a5c1f4682914d9e4d95ab2815dad11ef/biwawejezugujulobuwidokad.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb874e573c9---2662801666.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/18751672260.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b98cbf0941---20323592664.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/jepokutaguze.pdfIn PDF document text
    • 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_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 11128 bytes
SHA-256: 046a32b455b18903ca411a6a18bce5655f4209e558dc067962a2af5ccf7d4554
font_01_sfnt_off000110f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12907 18012 bytes
SHA-256: 898ff20d2bc61c06b2517b4ff1f4d7358e5c85861bb8724e22d5455d1a19cef2

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