Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a4b78b12275a09…

MALICIOUS

PDF

85.2 KB Created: 2021-07-06 04:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dbabf34e5be70922dbf105756cd478ac SHA-1: 562bf4dde9a63a8af2aa3fe1651899d844b0f8dc SHA-256: 10a4b78b12275a09196288ee568fba35cbae54cb05fa7251bac7979872602da0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to use these compromised sites for distribution. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=meaning+of+quality+education+pdf PDF link annotation
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16070052675024---64842326943.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/419c335eb009d91e0772ecb78dd320eb/wofomejanikawalopat.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/nurexetig.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/ponatasirarowufos.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/kilekosunasuf.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/dffb60e669bf009d6b10c3ffd34d6167/kejixotawuxubalerebigof.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/dbdf4d28d101e59ce85d9adcc79fddb6/29090496492.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6fecc16d---92348739716.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/fimomi.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/muwumasaxumetiduxelala.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a06e9c632---58983606244.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/55769e448a1da4af9e93ce0f75da9259/fawasujozuwugafaw.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/3ac8f4f507c899fca2ed7716087d5127/vojonepim.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/20783abec37de1f10bc698bccace3c31/37217699333.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/ede884ad4b66be06d6e7cfe829c1edc0/70165709735.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f3587220e---60753077469.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/4ac3b8cec0cdd0d6df9959c7bf1d5f2e/ratuxerasurovitikuzawus.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160709fd5bdd68---62531568255.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f91e96f2be---93333670027.pdfIn PDF document text
    • http://rafaelokazakov.com/file/91338584200.pdfIn PDF document text
    • http://didula.com/img/file/54573001994.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6ae4bbfd---12416366942.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-29/images/files/20101022434.pdfIn PDF document text
    • http://stl-hk.net/userfiles/11784164204.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/rig1vqnfptpj0d1sbpnmvavgp7/82203677171.pdfIn PDF document text
    • 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_off0000eac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC0 10880 bytes
SHA-256: 1f5307aa419caa6617da77f7036559ca1da463ce7c9cf7f6522995afaf9ca460
font_01_sfnt_off00010385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 17128 bytes
SHA-256: 24c5d13da1f6d63f79f80615b2f88d4992dc64cdf79bbcb18ffb73b9513c441b
font_02_sfnt_off00012f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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