Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0496340a43152b…

MALICIOUS

PDF

84.9 KB Created: 2021-08-16 11:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 822ee06ba10f2900107b430039481e35 SHA-1: bbb2aafb0dde7c7840671546a7afecf190f3e65c SHA-256: 4c0496340a43152bd8fff0f8b7dc3597d47ca25fec6a7eaaf564803f3dfbd8c0
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 0.9219

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://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/uhn2531rrt80c2ab8hnd5olos4/muzupofuv.pdf In PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/netoverujubodiwefefuwoze.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/6e14f33a0810f2b6065d158364bf2eca/59485378047.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0f5078840---nijobuzorepinu.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161182d94e58f2---fixife.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/85459535998.pdfIn PDF document text
    • https://geniodelweb.com/file/58940838047.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/8335158447.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/126c91e190b6f7a0bd4f0b694f0a9938/20388809949.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4177991ec---74578529603.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161157a845bdf7---58801666287.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bbe5135e0---34534137012.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95baf5f07e---diwit.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e771393f8d3---lemoguzisoja.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/ea5570fd2994cdae67d2c0529984664b/93425879417.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/73a2ed8aa3807deb7d59150bf2b75671/39861421305.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609880767b2b6---lizosupex.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/87794167087.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/95578360285.pdfIn PDF document text
    • http://collegedelunion.com/clients/76066/File/68768874594.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/b8cc942b2eb8ce3e155d6d1fbbe544f0/gumuxono.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/waruxupubedipukivumadin.pdfIn PDF document text
    • https://banghenails.com/upload/file/dijabifukifizonukivivuju.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/4ea12e9e06e718efa98d2b5a725b57f5/39941197493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pelicula+cristiana+un+milagro+del+cielo+completa+en+espa%C3%B1olPDF link annotation
    • 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_off0000ebc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 11164 bytes
SHA-256: f6b56fadeecaf9f71bdadf26beeec77a0651f6e86604eac9616313e25a0799c0
font_01_sfnt_off00010563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 18660 bytes
SHA-256: a09c9576c4539bfa8b67aad431e2c4959d34a6bbe3332f412bd3ed8835355eee
font_02_sfnt_off00013540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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