Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22f4211f17a2a6a…

MALICIOUS

PDF

79.3 KB Created: 2021-09-02 08:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7076b7f1e387d6240dcfa41c77208082 SHA-1: 2ac50a3379e7f12b0eba66a65e771c562cbc507c SHA-256: c22f4211f17a2a6a43258a9628cd1e7c229e51a7c692c4c4b5f00df22516ebb3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=collier+county+future+land+use+map PDF link annotation
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/56131517162.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071061937eef---gazarototedararamepate.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e31303e58d---boviwefakap.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/62049170682.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd89d87898b---lonafafekesuwebatotirisa.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/vizozukikuzajuwolekoja.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/18039575287.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cb6e115aef2---13169750179.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f299e50656c---fasamupenuroladuketawesu.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/6c4r6uiiu7cgnnvs5jhgorlepj/18776388782.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6a9a1fcd2---49793237813.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/44fab97465c070f058d2d8dd55226f73/kitop.pdfIn PDF document text
    • http://cichanski.com/Upload/file/nanak.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/64984955027.pdfIn PDF document text
    • http://kim-clark.ru/files/file/19860090965.pdfIn PDF document text
    • http://alkanboya.com/files/file///gexarowotizope.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/ferapogetosa.pdfIn PDF document text
    • http://614move.com/clients/4890/File/wibugonugebusarabuzujamuw.pdfIn PDF document text
    • http://vejwun.cz/images/bezesojilaxivuvuwemepag.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/56193957112.pdfIn PDF document text
    • https://computerzone.pk/file/24418172356.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e824915859e5a11ff47b555645c90a38/nesudusasuwijajeli.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_off0000d0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AA 17196 bytes
SHA-256: 9dce15d7173b2fc7ad124809c1ecc647a7b05c5e2e379175a455a165b0288361
font_01_sfnt_off0000fdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D0 11024 bytes
SHA-256: 1da92cb9e267948027ba2c79df71056dcfae37cbedaa3c986a8be839774d66a3

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