Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd977312e12c537…

MALICIOUS

PDF

89.3 KB Created: 2021-07-08 13:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76c9fae83ca4c7dc06e120b7a62a2b15 SHA-1: 490907e9000585aaa83400843b8d1d480d74ac1a SHA-256: ddd977312e12c5378b55c82e686ca6e5c25e6bbd7760c462393c6a0432b7494e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://coretry.ru/uplcv?utm_term=family+and+child+welfare
    • http://xlpe.net/Images_upload/files/ravokasarame.pdf
    • http://katheran.com/clients/55933/File/6814008790.pdf
    • http://kinel-hunter.ru/upfiles/file/68643446962.pdf
    • https://flardochform.se/userfiles/file/bavuwaduvukelokimive.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160859abd80ccf---monel.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d04fa90055---pokoderujotijarapafobovet.pdf
    • https://amrapalispot.com/userfiles/file/86654903297.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160de22836c8bd---miduwavobubitafujiwu.pdf
    • http://permanentnimakeup-brno.cz/userfiles/files/82351050273.pdf
    • https://pendekaremas.com/contents//files/vojebanezitavigoruveteja.pdf
    • http://vodnik48.ru/content/file/konunetinolobaxetun.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/vmd1oov1vqi3m2j2geu55g71j0/wotemerilamevo.pdf
    • https://reparationmobile.net/userfiles/file/36473730310.pdf
    • http://kojeneckezbozi.eu/userfiles/file/19469834134.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdfd.bin
a4658210fd3d59be033127bbcc04fef117c77005b3cdcbe73caee20a1f407f60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFD 16640 bytes
font_01_sfnt_off00012909.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12909 16792 bytes
font_02_sfnt_off00014120.bin
207ccbec9d87b73df45253180577581cd4f294fd832235c0834afdf7bdfd6c39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14120 10532 bytes

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