Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8977dc3e13e611…

MALICIOUS

PDF

88.6 KB Created: 2021-09-05 12:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28304c96419c0f461d1738bdd51e3e10 SHA-1: 3131585040587666e4fefd738a7bdaa2e713499f SHA-256: ca8977dc3e13e611074afee8af92001eda6649ef3cd34fd8fbc5194b45ec73ad
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and a large number of external links. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to various phishing or malware-hosting sites, as evidenced by the numerous URLs pointing to compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically highlights links to compromised WordPress upload storage, suggesting a technique to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=production+possibility+curve+project+class+11+pdf PDF link annotation
    • http://toyotarentcar.net/FileData/ckfinder/files/20210710_3CA5914DB9F84FA0.pdfIn PDF document text
    • https://ethnicacademy.com/userfiles/file/leveseru.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/diser.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/sp40cti4stjueoe8pmfhn963t0/kuxon.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/928290a0133b823b2909dd0037eef0fd/25839347230.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/fezojoke.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/wusonomazanuviveguxibebav.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/dorutole.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070fc3273b03---buzebe.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/82637b53af49ee6a2169ba02aec38066/57471835386.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/50801055683.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/gavavexovofemimigaxodeda.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/43609579381.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/dd1a41faf2796d7bf413325ed3826e4a/63809577846.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents//files/49822085060.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/u5h0ao5jkd8d74ok0usid8r4k2/milobunideziluvukividiz.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160708bcfedfb1---21536836979.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/36786688262.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/nujorulirixufalo.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/f79564d6824ead5c88c4726349e37bd6/36476395483.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/e4388b4a02d978d68a00b2369d918e03/55572055506.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/v9d7b6fcbtunauop73vqhoguj0/worexadanadin.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210614042437571388izg372.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/s1c8q2dsle0rhv9mihkapkeh65/lisixakoxegodemi.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/dobolumukomamize.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B5 11216 bytes
SHA-256: de7b3448c37fa46772835f22be3ef0747bb44a6e7a3a48cb153573f1b5e8c1ab
font_01_sfnt_off0000f1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A03 17956 bytes
SHA-256: f2b785c682391debe20bb0d403a7f7c04ee2f1f1fb5cab3dc2c93bac6e7ea8d8
font_03_sfnt_off000137fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FC 18124 bytes
SHA-256: bf419f5d6d74867f8d9e3230b8251218eb9c29d58c16559d66a0b57d14bf50a4

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