Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb22afff2222be51…

MALICIOUS

PDF

78.4 KB Created: 2021-09-07 12:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 7fac2ae1e975680b12b7ad3a242ba0b1 SHA-1: a234cfc6cf70f1ab808076957543720893264ab8 SHA-256: bb22afff2222be511c231aea060c86ecafe9d29ac048fb1c51c97343599b3325
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 0.9917

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 http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/r6nl8bh757gkall3bh6et726c4/xufinigipepovobadaruwenu.pdf In PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/kogafinixubusub.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/bukozawijabumejozimun.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/mirig.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/ruguzetemuruvofu.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/95290153447.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/vhp4tc9u5bm1ed3ftk56devjo3/ritapamimizunolewitu.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/22268068337.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/735c211f0b47b6105d480bde9b257ce7/mabuvidadiparoso.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/60bab2188952e8fd90c52264e1d2e18f/45274595782.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/98293449794.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/jivapadopexikoxanuka.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a378deacf4---54976649558.pdfIn PDF document text
    • https://songhongresort.com/img/files/kodesojetuvinekelozeji.pdfIn PDF document text
    • http://whatdwellswithin.com/file/tuzugamimigijugofeva.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/sonubo.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/91351638627.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d190a6bfc19---87054932481.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/19377624659.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/32606054591.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607311283b304---gadugufufajojopu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b3718a7e9a3---norumosagusumezulafatifu.pdfIn PDF document text
    • https://brs.jo/userfiles/files/vuvip.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f1fb06210a5422180575e13d7fe2ec14/bulapaxapipofen.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0956f1731---93656352121.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/94179088329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=hindu+gods+ks2+worksheetPDF 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_off0000cd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6E 17836 bytes
SHA-256: a1af3f6dd0509b5e2e2bc6f4e3d5f0052af5068f08222f45a3c3cfa7c78e815e
font_01_sfnt_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 10708 bytes
SHA-256: 54f24624f2580a2404f925fba91e72e6582ba310857753a6112fc68ea562c16c
font_02_sfnt_off00011388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1