Malicious PDF — malware analysis report

Static analysis result for SHA-256 972411c06d05fdc6…

MALICIOUS

PDF

89.3 KB Created: 2021-08-11 10:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff838bdfbc18af150f975008d7662f42 SHA-1: eb02dfbd53881cf7af1fc50c7f169ce64276b0e4 SHA-256: 972411c06d05fdc6d423a7bfa0568db641be86c61123017cc965fb17943d3ba0
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, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest an attempt to manipulate search results or direct users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://chcial.ru/uplcv?utm_term=will+schools+reopen+in+2021+in+illinois PDF link annotation
    • http://banglatalkies.com/dynamic-images/cms/file/botawotaritonagufobolud.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106221517365239.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210707064715.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbc88b303e---momogetuwonoleje.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960f8963dcf---favexadajenonux.pdfIn PDF document text
    • https://keongracun.org/contents//files/pofigu.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d130fb1b6d---13539043694.pdfIn PDF document text
    • http://targdenunti.ro/userfiles/file/pugisuzo.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/52012629483.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/72756426206.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/gadamajokaxevetavo.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911ad273e47---beninewomexulevevejulevu.pdfIn PDF document text
    • http://tcihk.com/userfiles/bovolivoluxirazareradigev.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/59da0f084eb00e79de366d419db0c0b9/11107482542.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/97a16e25c583607ce06130289e877bca/86647432085.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e2f96796e---sanuzex.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/58f5e3686db97d79a310595d4d6b3e94/39590969055.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/bomefirozaxage.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087b0082a01e---73007988227.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/96a896cc49566ff8c556b4710356d8b1/45240570455.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/940352da39864a45d4c2325f6c151508/56152557403.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c528e0f482---lezudokurolaladejamal.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/86a22617573af1bd0b5b3c066355a958/36608158178.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/83691640633.pdfIn PDF document text
    • http://aps-mes.com/files/file/gibukemedububoliv.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_off0000f804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11016 17644 bytes
SHA-256: 7f9aee2464c6f8c0789e9733580c79d85ced7c6b86dda833dedb55c5d4eee489
font_02_sfnt_off00013e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9C 10500 bytes
SHA-256: 834bed636b67af02b670c6dfe2bf7512810d76e639a081cbe8dad50ec0717247

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