Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f132f7800655ea…

MALICIOUS

PDF

78.0 KB Created: 2021-07-09 15:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 875155c07451a0a55af8d363b292ab54 SHA-1: d08f1fe810786d53433c98d50fd9c44f320979d3 SHA-256: 24f132f7800655ea4627b8d307e057cc2d59d824248d96835c0f6888d5d955a9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress upload directories and other domains, suggesting it functions as a link farm. The primary goal appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://bestbuyfromindia.com/userfiles/file/54845567635.pdf In PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaaa138238---59301520316.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/7f6bf63d20dd311ed17a45f389afeab7/37470674791.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084bbddc74c7---97278993723.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2b74d328f---xapifedatituripibazufi.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/jepiguj.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/maverunajuzuve.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607321deb5791---jozit.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/184457943981a92df0173aa4de3ed39e/patujudifura.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/72690364069.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a36d22b4c54---gojerefugagubepaliled.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/9k69alubt59ncb7h06rjop65he/33886759132.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e48656c74ec---48537602018.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a61a2ccda70---6160144681.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdccd0d98ca---tapalerowexetibazifor.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7prbmaptiebcfhja9d16dllk34/77333517930.pdfIn PDF document text
    • http://asfalon.com/__files/file/tuxetijifufamemixag.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/magitopojufiwafonovonarib.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/wesekawatokawupufipupiw.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923f7b2fbc3---jazelulirofuxizituxof.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160810f3e3eb80---kilawubawepi.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/59424777315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=words+per+minute+for+3rd+gradePDF 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_off0000cd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 11060 bytes
SHA-256: 6455a1de95ca3280c9de87737454ca3bf0249a22e8e4091bf5bccf892cb6090e
font_02_sfnt_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 16944 bytes
SHA-256: e5a8c3ea892092eba9c44bbaa943e6526f8f93bc628133f92817e7044aa50410

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