Malicious PDF — malware analysis report

Static analysis result for SHA-256 10093028ac51a129…

MALICIOUS

PDF

74.0 KB Created: 2021-09-30 19:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c674070395d5ef5a1adee97d543a1a82 SHA-1: 2b5cb97eeaa7b705864f728adf29fa3015d909bc SHA-256: 10093028ac51a129da27185ea5383697158cbfef0f3d3a9ad503ec24503ddc27
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, several of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://parlagame.net/calisma2/files/uploads/81815497032.pdf In PDF document text
    • https://baatco.com/ckfinder/userfiles/files/71561714748.pdfIn PDF document text
    • http://mobiliteit.nu/files/95835151755.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/efbfbda4c98ab300c31d4603929417a7/35709567814.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/77593443608.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/93830048682.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/75275287865.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/25820421958.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b8bcab7d8---94009502390.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/9d6b66a9978a044cf00ef7b7492f8bb7/famazisubijuna.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109182305186585.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210915210703.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/24989998436.pdfIn PDF document text
    • http://akademibt.com/resimler/files/50283395722.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/fuduguvezosafagizenaf.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/naxipaz.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/zujigizutir.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/5199692574.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615165ac2084a---pixavaju.pdfIn PDF document text
    • http://yuha.be/_files/file/6002573897.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fef8baedcc---pibepekifiwuwa.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/jukebatilulov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=walter+riso+pdfPDF link annotation
    • 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_off0000b95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95F 10380 bytes
SHA-256: 94c0e5ca9abe7ef8982b9050835528f129c06a3180bfb158626f9fe0fbabf8bd
font_01_sfnt_off0000d0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F8 19008 bytes
SHA-256: 96f07cc2f7dab46fccb1e5b25fd89ebe86c3a33d99f00aa424534d1424b16eb8
font_02_sfnt_off000102b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1