Malicious PDF — malware analysis report

Static analysis result for SHA-256 3baa5cba72cae501…

MALICIOUS

PDF

87.1 KB Created: 2021-07-28 02:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 66be345dfbf09842050a4ffd6cb2c28b SHA-1: c029b444a21bee333ea0aa0431b0eabaa8ec8f77 SHA-256: 3baa5cba72cae5017d5a16e8dd8e93b99886ae52ceb8e299187540f94e3cef58
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or redirection scheme. The document body is heavily obfuscated and unreadable, indicating it's not intended for human consumption but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/tog59dbtoqugiodqrphlt0pqpj/fudipidomiluso.pdf In PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a69b5f9e9b1---putewemutonisukevozivove.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc3738bc67---mibazepawiridumuxe.pdfIn PDF document text
    • https://alutat.com/data/file/zoxadamitiwolevap.pdfIn PDF document text
    • http://cookbox.nl/app/webroot/files/userfiles/files/sinunopo.pdfIn PDF document text
    • http://perrymanreunion.com/clients/f/f8/f8644f0eb9578147d5589f75b8c3e300/File/99555376954.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/52a96336a2eeb374798297a0ea063b70/zinerejarizerukopewaf.pdfIn PDF document text
    • https://senhewood.com/d/files/bejijikawod.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/mozuzilajikokigi.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/44584164385.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/0a7a3bc33db147143cbbf0e9385aea7c/15839110663.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/zupanamabesoxevavizorodap.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9460d7e8---76498669285.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/luboxupuvukepar.pdfIn PDF document text
    • http://usagimatur.com/files/others/vitajazigefosu.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/noaeihpnemt9v1a7f80vtf899v/nexulanofo.pdfIn PDF document text
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/39603553075.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/d180c510c5a2d4dfa9c1c5a9a0483d0c/95575889008.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b13efdafd9---voluxoraja.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/juzatorujuxireke.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/53062098277.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/xurodon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=unblocked+games+77+1+on+1+tennisPDF 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_off0000eef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 17584 bytes
SHA-256: f7d759735f0880a595b25de744c9d70310a68ecdeb46869f6e299dead47dc714
font_02_sfnt_off00013466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13466 10952 bytes
SHA-256: 83f1db18287944efed97d7fedfd18f35ba7dac9a3ee7801bbdbded650eb41ad5

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