Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b17f1bfaf556bef…

MALICIOUS

PDF

98.6 KB Created: 2021-07-25 05:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ea898caacb90c08860da783b3174f1e3 SHA-1: 4ef18e4e66eda8b078a067b83513469cd4997088 SHA-256: 4b17f1bfaf556bef612d4df87a993c2e1fbfa444c7e9cf3254b9fa797b9cb4c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9976

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://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/smok7qd3fbbieu8l6q89b2odl3/5907448465.pdf In PDF document text
    • http://studiovalentini.eu/userfiles/files/84100395330.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/peferatiz.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/pexosepigegem.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782dc75e8dc---pefuzopevimozajano.pdfIn PDF document text
    • https://ferropula.hr/files/zinerofesiru.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/dinudaxixasof.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a8e465d2f1a288f7019e26b2c7e67203/nixogupusamulifajex.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/72838439015.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/lu5aq1fvbdl624fi16572745r3/suwin.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071258c44837---31277295153.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52309df062---59086087533.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805d6c2e70f---54425236334.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/vesapofonetoxir.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/duwofesufojino.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/kilidosinepu.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/korb4lpouo8o1vqrr03c20bt61/69623368168.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/79358639144.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25fe9ae525---ratewofekaf.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/31979458738.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/zogadotir.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b412b472627---26014661604.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a72d5e6ff43---25080920704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ikea+brusali+desk+assembly+videoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001008c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008C 16180 bytes
SHA-256: 890fbedf969ded8bf4768764711ce6128b86a33e3263eb8223778476ec57582e
font_01_sfnt_off00011638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11638 20120 bytes
SHA-256: 22cbfa23ccc54471851d647d514b868dc48377b1eaf462e343f56766471749e9
font_02_sfnt_off00014b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16347 10668 bytes
SHA-256: b85ecc56b1573f8fde2da592137fd8cb518ab2e9bdde48972904d97b0b24e9a0

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