Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f310c90d6e7702f…

MALICIOUS

PDF

85.3 KB Created: 2021-08-16 20:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 889ccc438196d74eb48474aae16488b6 SHA-1: fb3d2b6420f1a5684f2c80fbb03a39c03e24e994 SHA-256: 6f310c90d6e7702f5f445295ed9ca861764ff0cb0250cf6b54f0c062ecaca39e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV and an ML classifier as malicious, with a high probability of being a phishing or malware distribution attempt. Heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs, while some are marked benign, are part of a larger pattern of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e0346de356a---91617006199.pdf In PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/fajevujafafiwanikewu.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/bacc9575966bbf5e63eda1738dc6cfb4/mogisalemazojazekamejo.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/4713d409229e3n2kds1g15be16/29467797593.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdfa64cdb8---jisarudejojuxuf.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/mogakupegapolulo.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b1e98756ff2b5a54c15e9ffca71276d9/2125323936.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160da0ce8b988c---66135665686.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/52ec76fe7e24d049c870884b9495b650/fufukazivesow.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/70026803447.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/93927709345.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ametuwanuwerogiwemevevu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/7ff0b1ad385e985a21a09743dd9d4b6d/nuligozis.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/woregiloligoxufotefe.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/c730d8307e33fc2608845b2f431291e4/rediv.pdfIn PDF document text
    • https://eurotig.ro/file/riporevavesagoxipexumur.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/77525443251.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc3f8e1381---pexowozijodiku.pdfIn PDF document text
    • https://kawanmto.org/contents//files/89470657774.pdfIn PDF document text
    • http://walker-doss.com/clients/4/45/450b4a4af5ff3f13851793278d9c7ef8/File/78288358871.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608db964b3918---56263555974.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents//files/37805434719.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/68526917027.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/3183355159.pdfIn PDF document text
    • http://nprofit.hk/userfiles/86798307706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=actividades+para+ni%C3%B1os+con+autismo+de+tres+a%C3%B1osPDF 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_off0000e850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE850 16956 bytes
SHA-256: 46fee360d341edd0274efd2babb237275243ce2fafb87026e8bad947220f5244
font_01_sfnt_off00011326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11326 10984 bytes
SHA-256: 596f266dd43c59693c0fe31ef1394c0b7af5ca572d6e1c4c5f75aef54cedb61d
font_02_sfnt_off00012c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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