Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66fd56aed82c9f7…

MALICIOUS

PDF

71.3 KB Created: 2021-07-05 06:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 180b474be34df5276daec82abeb28736 SHA-1: e16401ceae502e635473903217ba944e64358864 SHA-256: d66fd56aed82c9f721de1ca7febc713f4f08e8893bd39ce253a3f6f617188a0c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a link farm to redirect users to malicious content, such as phishing pages or malware download sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=this+is+not+a+pipe+foucault
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a143c8e8d052874c827feaf2710d76c5/69001325674.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59d41e1308---libutodavekekorunekomogad.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a88e8e45448---sivura.pdf
    • http://cpgny.com/userfiles/files/68112999696.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/f10a3d44f9af8443d8481e92bb82bd27/xefasutud.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee941d9f3e---50873512145.pdf
    • https://eternalbliss.net/file/mebogurojudemofarupaz.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160789e1f57456---gonux.pdf
    • http://pogservice.ru/userfiles/file/77467994700.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/41223649088.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b42523c302c---ripisadog.pdf
    • http://webhenevents.com/clients/868374/File/62867450026.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607775f51456e---99871198740.pdf
    • http://jevades.com/aircraft/fckimages/file/20238842921.pdf
    • https://slide-bearing.com/d/files/wefaz.pdf
    • http://hzzxtl.com/UploadFile/file/20210625212023060.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160733a08dbada---80366587228.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ad62884d6c8---getevimoliwopir.pdf
    • http://maternites-catholiques.org/ressource/site-image/files/muwuzoribufonuvi.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa71c2ce6bd---3948097278.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/e85a5f62d8985ed1b58062e6b3852ff0/15965750809.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160810a9cf300e---zuliva.pdf
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/wefonuso.pdf
    • http://kayapaliinsaat.net/file/78234938731.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b875.bin
e98acab32fc2191edbff8ef1d95e24882dc11f578c9a8a5fe7f1f8f3833e1120
pdf-font-stream PDF embedded font (sfnt) at offset 0xB875 15528 bytes
font_01_sfnt_off0000e00f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE00F 16792 bytes
font_02_sfnt_off0000f826.bin
1b2e6fd238aa4b1a713f66e697e38f51a9943cd83b82ab8f1c7b85bf41633737
pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 10540 bytes