Malicious PDF — malware analysis report

Static analysis result for SHA-256 37fe7f654955cbd5…

MALICIOUS

PDF

104.0 KB Created: 2021-08-25 22:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: d7ef64b0129e4e3c93253e7f60a5dea0 SHA-1: 8e4c28aeb0038f31724f20a864fbc579bf0ee197 SHA-256: 37fe7f654955cbd5ae0d3c6d9c1db2162cab5b0b6d255e8df63afb4b8036cfd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://nbnjl.com/userfiles/files/jinapuzurutevogage.pdf In PDF document text
    • http://aucoindeshalles.fr/menu/file/vipegituxizafo.pdfIn PDF document text
    • https://drsoleimani.ir/userfiles/file/napenokupikavogi.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160fc3913b6972---mewarabigijokizi.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609a555e08df6---jurob.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/lurazetapewusofugegin.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610da44ceb923---murofirogakixer.pdfIn PDF document text
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/59390996865.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608904c78a0e7---dozemum.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/to4l96quoab9q4fauha802627l/wuposuzoxufu.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2896302823.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/70893641313.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/f2e92dcf66bcffc1e1450e4a3698902f/49755818989.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f94a902463---mupimoz.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16103132f914a5---fixaloleputifi.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/gupalelijagotuzikaluta.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/57vove9c2fqttrmkd0dsb9kh3g/vazogoripudujobizawuwiku.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/66193387470.pdfIn PDF document text
    • https://abeess.com/userfiles/file/28197792704.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/340e0157709efacffb3b45a5cf6a1c7a/soxamirevokokojexe.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/33472542382.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160903728131c4---48133878175.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/15478117889.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4af25bed6---guvipebutuwusalilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=wake+up+messages+for+himPDF 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_off00013037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13037 10744 bytes
SHA-256: 4fa7a30b1ff571bd686cc51af67c4ab684c6bae46d3dcd4a30386c11113c19fe
font_01_sfnt_off000148ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148EF 19460 bytes
SHA-256: 19ddb5e0d26718a1feebd53f1452ab1bf65239863dcd24daa29100ad33f84064
font_02_sfnt_off00017a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1