Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0576f86786f9db3…

MALICIOUS

PDF

76.0 KB Created: 2021-10-08 00:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 799bba1d5b8b24308ebe93d7df7d1206 SHA-1: 636f41add01441edd753f009b6d0046714d51628 SHA-256: e0576f86786f9db34dbe1495303a1aa26ec2b8ccebc8cb117892aab62c7e0a25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://msnladyboy.com/ckfinder/userfiles/files/fajijoboseburakajekigafu.pdf In PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf08734f1a---87010891276.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/27895056315.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/nuxuwijetopixuxi.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/75658454879.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/61298140790.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/23767606055.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/rutexedexavoweperudumu.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/66118148473.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/vuvanurivujazigifusis.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/61764078816.pdfIn PDF document text
    • http://quinta.cl/upload/files/bedarosaza.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/vexikafarimelerileparan.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109111258109583.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7299ea767---38536365393.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/zamekusaperopagezamo.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3r3tudhn5i4pac1kdiv4j42ft6/18221976522.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/74573497964.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16159467a1a5c4---46360755529.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/53092806158.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/gelevokusitubodebotep.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210903_1904ED83DCDE1B6E.pdfIn PDF document text
    • http://sarafis.pl/img/userfiles/file/92105421278.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/duniped.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f12607286e---resumopejakejuxabudijuteg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=los+magueyes+near+mePDF 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_off0000c3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 10384 bytes
SHA-256: 9150ffaa5da4e2e28564601d6cb924d696f8d0f589eee75d88d00842b0ded09e
font_02_sfnt_off0000f389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 18136 bytes
SHA-256: b1d55c110c63a849f23ac3262b86ee9bc6b0cb9897ff38656302f1f4196e5df4