Malicious PDF — malware analysis report

Static analysis result for SHA-256 41309ae84b0d03fe…

MALICIOUS

PDF

96.3 KB Created: 2021-07-22 10:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e60897611f66e8a2022dd4329e9ecef9 SHA-1: 87525ff1ab74c259cb230dcc749b97d9b99844ee SHA-256: 41309ae84b0d03fe2ed097186e8d563a266d6251f6b26ce19ef20c322d087a3d
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations. These links appear to form a link farm, likely intended to direct users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary attack pattern being the exploitation of user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724c8702194---15421822193.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/kjokk8pqloq84ec6r6qcn0bqev/disonizejulujoki.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/faf019cd1c0249ba91370ea873b9e637/pokopibofawavojojugar.pdf
    • http://artpolinakuzina.ru/pict/file/neluzuwupanulu.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/fb689cf59edef5a849304774562133dc/gosuguxuzomolodepikax.pdf
    • http://ugyvednok.hu/userfiles/file/fapilonegunor.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/50c8f23b7316be56070cfa8709fe16ce/rizaxutedepusuxaj.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/6n4g92b9cc61dct53k5ie01tc6/41574398097.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/tm5gvsjo0q4tecb2knm2giuq2r/zudumejewefu.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/6cf0ac8e2f0abd6415111246b4533a48/kudajedudojibozuxewavute.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a419b9c801d---1583733976.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abad7bc6f46---60363911393.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/03cdbaf4043829798e02bea10ee8f727/16040547356.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/eae4cb7ad5e8cbb9fe1066f864ee404d/17002108416.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb0930183f---95774828695.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160866ad31dae4---15008190725.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f7331835cf3---talutujuxavopevefabag.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/8fc322d786adfc660fb8d4c4b29ccb8f/jozalemojodefazage.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091776993799---sutevudezopalenez.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/08ff8dc90bbf203d68ca2c7f3c77b14e/40546181225.pdf
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/35860466076.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ic9jp69oc6q4kkqqh900ohjcl0/budumelumaruvewagesob.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2ebb8b698cc6d78efb71bf251f39e19f/binikupo.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/c005928123f8ccc8121df3836b419834/zofanoduxewesepite.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mean+of+truncated+normal+distribution
    • 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_off00010f87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F87 16792 bytes
font_01_sfnt_off0001279e.bin
5360b040fec92a59813012f19653cd608860c0f3d322792d3c2728b28d8dbdb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1279E 10872 bytes
font_02_sfnt_off000140b4.bin
d0e0fc07f44f1acc452429bde7aa28b145dcf4253dede4759f2ffb09c2720988		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140B4 18832 bytes

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