Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f09d8e45b10037e…

MALICIOUS

PDF

124.0 KB Created: 2021-09-07 13:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 63674620c57dd5d9d24b7782aa63cc3d SHA-1: e6a5aee626c1a32a418a0f4d39cd6be564083942 SHA-256: 5f09d8e45b10037e16f7c9f943a590cdd903adc83ad971d1dc05aba7bd6b895e
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or other potentially disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' firing indicate a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=bharat+muni+natya+shastra+pdf PDF link annotation
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b0607cdb4---28013594073.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/nogubukagagikoka.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097049a50b6a---pilemuxaweva.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/lugopelubujogul.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/72042031836.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/kokifavipanuvunanojig.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/wilixupazezufenewiriwug.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/54828254127.pdfIn PDF document text
    • https://webmenuplus.com/images/file/54584531987.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021072303290247.pdfIn PDF document text
    • http://cabini.it/userfiles/files/lesidatinofexinivaladowuf.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/gorobir.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c90df21e79---63914116102.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113cfdeb1748---92740114094.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11ecc4e4ca---2112707108.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/fijizaj.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609005196f5b9---safodi.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/fanalepakenoparivebuxo.pdfIn PDF document text
    • https://digireg.lu/upload/temaxemimusiwanedimigaf.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/jexinubeparux.pdfIn PDF document text
    • http://freewest.at/kixinipojoderifokuj.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/tiremabepizuporevejudixug.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/lipavufijesilalepixavikof.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/f8f93ddc2cacc50ac4a864542295ce08/dapobogudupinebadupuk.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_off000171f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171F2 24740 bytes
SHA-256: 6cf2c46a7474eba0e8d1ea95a14c053850895c7fa46255dc9ad1092adff8bdd6
font_01_sfnt_off0001b1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9C9 10732 bytes
SHA-256: f177e7a1cc223df01e3fe806441db074b0a097a3c40fc73f7837aa5ef2887543

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