Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fb2434a5cc4f23…

MALICIOUS

PDF

86.1 KB Created: 2021-08-09 10:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e0fa2f328364f9cff1632032f51489be SHA-1: d4e1fe81680d58768796c8bad93c92d48e88697f SHA-256: 83fb2434a5cc4f23fdc507c33e16acbf7f01e377e1b78fa1c1572cf20d71c9db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload sites. These sites host further PDF files, suggesting a multi-stage attack or a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075dfd62894c---jawimutawutise.pdf In PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/dca7f1bf2947448cb2d3d67f6c235d96/53155366567.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/0fe99691becfae72150d6109536724fc/lokoxananamet.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/texedutumepotiwitisig.pdfIn PDF document text
    • http://edgecs.net/documents/gesir.pdfIn PDF document text
    • http://nessium.net/userfiles/file/dodesutobobipava.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/fcb9de2081a548929734ca1d36c12c54/80515371231.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/3a0d05997375098a21816d2d8c7047e4/gimibuzo.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/48949360515.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/v0lj6p1378j9sggevjn2r2jv9t/verejusiruwojir.pdfIn PDF document text
    • https://aokman-drive.com/d/files/7315235466.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/20410104923.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/59122306129.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/tilejawizegikozuxuga.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/sb0ljcrh7dcjjfrolghkr19ot8/80138051040.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85f885946f---41712545078.pdfIn PDF document text
    • https://securitydm.net/slicice/file/24408779149.pdfIn PDF document text
    • https://asiabiru.com/contents//files/16321634653.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a01f80fcc---setibiw.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/81b46cd47c23a779fcf620877017269b/62526364576.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/xubevebugesus.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/24389283930.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/lokinajumun.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/45f1071aaf591abf149002763e6d4f4b/juvineturof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+long+to+get+padi+open+waterPDF 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_off0000f06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06D 10476 bytes
SHA-256: 12785a40f92202260128da33fbc48a7027bfdcf4862bcd519695b701ffe4d42a
font_01_sfnt_off0001081e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081E 16120 bytes
SHA-256: f2e8525827c2287a36a5ec49799de5611bc6c6362be392f9f922f5d8119e3330
font_02_sfnt_off000131a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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