Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0521e470888c73e…

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 21:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 5dcac8941ed64f710c541e4cba352bd8 SHA-1: 64796941982fc91b3908bd24901fe8b01f91c54a SHA-256: d0521e470888c73ed4480ca8cad87cb085847d07a9bd2f4a445360f75bd296b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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=rechtschreibung+%C3%BCben+f%C3%BCr+erwachsene+pdf PDF link annotation
    • http://casier-a-bouteilles.fr/file/21700275432.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/fufinuxenijafade.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/22411451629.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/josisejoxivegezi.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/af7ed0407b588a978975268d35623271/16170445137.pdfIn PDF document text
    • http://unseretochter.ch/images/file/jasovamisuxugol.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/zulivubupo.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/29065388580.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/v7074hteko0hbcvl51dqm9r6d9/ligadadikefemelani.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a898118092f---27988594268.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/58089574775.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/babalolajakomowozej.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be8d4f3f48---78863579867.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/b941eb32fc999d9b3ce5e15d2cd5df73/malodinomotelukep.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/nrsdqgtfojgvg6v7f9rim3q4fd/92530966636.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7dd762931---61611575294.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/75453203356.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/fezazevene.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b39913018e6---bojubojoso.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607906b72c365---tumaroxijilewav.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/19631813999.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/aa9adb7af9aa7d04bbcbef8f15ee9dbf/fawogafewenon.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_off0000d1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BE 19888 bytes
SHA-256: 85b621624368c3f10ee4c46984a01e20134d088c416c94d4c5a8e0b87423861b
font_01_sfnt_off0001045f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045F 11296 bytes
SHA-256: 8fafed1901fa1668a4e5c7061de75e4506f1a9eee1112ae4bd5a43ed18d24b1e
font_02_sfnt_off00011e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1