Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04299359c8614a4…

MALICIOUS

PDF

83.3 KB Created: 2021-07-04 13:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fc4a22bcc2b8b0dec17a3f3a8b99b2b9 SHA-1: e08c9a487f3a9a1ba47adfdeb22481e8e696095e SHA-256: c04299359c8614a4b2d1ba644b4484b03846e4305c2795f91226ade0f9fc8590
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery via these links.

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 http://gopherandsquirrelcontrol.com/admin/images/file/zoravo.pdf In PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961b3bf2191---7595364282.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/mbia00f9cdskg1s5v0b02qc26k/14950221637.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/9g1erltgl85vsqu8od7l7l3832/jelawojozata.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff495193f6---1548538591.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/9886a564c73b0a1bc64616ce38f09ff1/zukazodavilibetumuj.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/7357420912.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/fibalisofevofoxalawipuvu.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/83498834175.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/75203629785.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/94231550563.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796af57d86e---76847302044.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/zofuseku.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/65eb1d92c1d458403fcb5c71ca7f55d0/losanupewo.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b44d3151e78---femukatepodexiloxos.pdfIn PDF document text
    • https://soechi.com/userfiles/file/40460212826.pdfIn PDF document text
    • http://stl-hk.net/userfiles/77919391906.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/60353032300.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d903e4ddfc---47200760095.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c880f561ec---jebew.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/66529a0421c0ecb350de7eb2fa9411ad/94324555745.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609843f21506c---nemekafavezatukaliwasumo.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/38mbt3lub4bv8k74c888m857hk/70456704378.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/4208009.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceb0375fdb---54212176764.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=tell+me+baby+are+you+done+talking+lyricsPDF 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_off0000dfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 17344 bytes
SHA-256: 656a349590dd4c580c539099e9eb3a26b60f39301a79feec9abe367c2907adb3
font_01_sfnt_off00010d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001254b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254B 11124 bytes
SHA-256: 6b5303ac18630043c761be981513111c58db70a9e9400d70285a862437c60218