Malicious PDF — malware analysis report

Static analysis result for SHA-256 a310ad5e6dfa9d6e…

MALICIOUS

PDF

89.7 KB Created: 2021-06-29 12:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c6af0e4cf208d866a38796d3e058eea SHA-1: 13a5e400c99f299edb4266fddc7e45b9b5923f50 SHA-256: a310ad5e6dfa9d6e18bf50f2569075f76fbc1a79d64af3f04d3643f254a7d2fd
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious, websites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://chcial.ru/uplcv?utm_term=dry+aged+beef+tartare
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e27f55fd1e---80273436709.pdf
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/niwetutonogamoz.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a9712b67001---19646100972.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/8a29c17b137093149b4944f7ad112889/95218668850.pdf
    • http://www.kickcommerce.com/userfiles/file/pafofagas.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/9bir6hr6c1bn0f7adngqnf3bms/semikaguxozodogunifuvez.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf46a89fcc4---juzumufezuxonowam.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160a3170386332---subodufolelarapu.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/97q0rdu0114k7qn2hp1mps54bd/13440046141.pdf
    • http://jjmcp.jp/userfiles/Image/file/59268686413.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b00f07cb44---9725632316.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/6349135986a3566b0c15f09bc537bf89/nupirovatarisemekaz.pdf
    • http://praguetransfer.com/files/file/legiv.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16096ad67a3d61---bezoxumi.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820c0144ad7---newobigowosuril.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075369c1ce8a---bibezebonilibifobitatix.pdf
    • http://naviway.su/upload/files/59612879263.pdf
    • https://waelfawzy.com/userfiles/file/
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16083ed8713d11---lewan.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/q65asvkhib6hsfnfdbhcgkcci0/runekalasuratufilosok.pdf
    • https://condominiobrisasdelnorte.com/userfiles/file/tulagemil.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/a5fdpua74ohobc137l2ui42bq5/61512716173.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f30054721e---35334546516.pdf
    • https://tamphuctriland.vn/upload/files/52087755871.pdf
    • http://twothirdsmajority.us/clients/38522/File/88669894494.pdf
    • http://amirafouad.com/uploaded_files/file/98139518237.pdf
    • 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_off0000f9f4.bin
cb743128f05a9cca26c4765d65a11c81079bae73c818eb4df0893e4ee6cc5123		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 17980 bytes
font_01_sfnt_off000128c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128C4 16792 bytes
font_02_sfnt_off000140db.bin
8a5157c751cc3e675595a3df20ca659edbcb99d889104a63bc320a83bbc01cb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140DB 10256 bytes

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