Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3b7c897aa35b03…

MALICIOUS

PDF

84.6 KB Created: 2021-08-13 21:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc254d2896c67aed23772cdbc63e7233 SHA-1: f59cf2243f7711df408fbf8f766385f7ff089998 SHA-256: 8d3b7c897aa35b037e6887c149303d05c2a916f69e2cf750080d2910c12fd855
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The file's structure and embedded links indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a117b26afd1---tufote.pdf In PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/a383c0ff1171ab366fae202eb076e52f/28902686044.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/lifebonizanujopifokok.pdfIn PDF document text
    • http://funperm.ru/content/file/letewejomozodagikosegur.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/bevigafusazedezaruzexu.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/debuxogebos.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610481a85f527---xilitideruvotimirawobomup.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/wenewikosezewixaxer.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/c0908a9edca5c3027635903d7160a62a/fekuvilofimojisuzonaxufas.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/65699997869.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/penurijare.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/gusezisubezure.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/0126c6cdf71d831af5f5f39e961cb9f1/guzege.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/toluvifojeledabiwosaten.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/ea297a13ec05642ec87262c8e3e4c697/89431473021.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/jozerowisekigeragut.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/nugujek.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d4a7e3521---17663798800.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/4cb364fa61e33b839823367fc4e89e7f/semujipezixo.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/48092319581.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85496205861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=%D0%BF%D1%80%D0%BE%D0%B2%D0%B5%D1%80%D0%BE%D1%87%D0%BD%D0%B0%D1%8F+%D1%80%D0%B0%D0%B1%D0%BE%D1%82%D0%B0+%D1%80%D1%83%D1%81%D1%81%D0%BA%D0%B8%D0%B9+%D1%8F%D0%B7%D1%8B%D0%BA+3+%D0%BA%D0%BB%D0%B0%D1%81%D1%81+%D0%B8%D0%BC%D1%8F+%D1%81%D1%83%D1%89%D0%B5%D1%81%D1%82%D0%B2%D0%B8%D1%82%D0%B5%D0%BB%D1%8C%D0%BD%D0%BE%D0%B5PDF 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_off0000d6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FD 21460 bytes
SHA-256: 748dc45c8f04b66ec2747185b3fc39ae9509b345672955856ca4fca461aba94a
font_01_sfnt_off00010c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12469 11772 bytes
SHA-256: d84d2eb9ff0983d2c740d6d220361b82a64447cccebe39cbdaa7c04e5ad7bdf5

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