Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e5f77be17dfeb4…

MALICIOUS

PDF

88.1 KB Created: 2021-06-29 04:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c8800b725bb53f334241a263e38e03e7 SHA-1: d0fe0720d668a5ca8a9b5f6b6d15e6e038af3c63 SHA-256: f3e5f77be17dfeb4b9b114d236a98f647e7c1c88383624f503621cd4846c89f3
96 Risk Score

Malware Insights

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

This PDF document was flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters suggest a coordinated effort for SEO poisoning or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://laurallo.com/ckfinder/userfiles/files/65651048454.pdf In PDF document text
    • https://argumentua.com/i/file/vudikuxo.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/lokexizow.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a58c55c5caf---tudijekidugipufaru.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/vinujexerapajenip.pdfIn PDF document text
    • http://k1a.ru/images/files/file/rexikobave.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743d302e7b4---tosonomubaxukutijupan.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/kuvota.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/xaxovenorelojom.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4250a9cef6d1e381a9ec7091f9a8e26d/57115402133.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5070688d8b---gomobawevidod.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/tuxomazotulugidozoxuw.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/d7ornh8rsebcbs861qflaiqp5h/87407532197.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/de8100ccd57c01a8965cdc5582832514/40813998959.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/345808fa3cd7920b8ff75bfcacbc33c8/56069928998.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/vokupejawetojipodanirube.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad454c60e4a---59750149820.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/894769bfee80c0cc878727f88fa31008/82962562185.pdfIn PDF document text
    • http://artospace.com/pics/file/41369037969.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607966b81ec8e---79865132408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=baby+boy+names+starting+with+pa+in+sanskritPDF 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_off0000f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 17228 bytes
SHA-256: 8d270be815e8f39e2d25af49f2a481d9c6111485a5b7b36a489756e387dbe482
font_01_sfnt_off0001211a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13931 11136 bytes
SHA-256: cbc6fd0e5e345bde90c2a8f583d9ba0c087240f013428da3713a1fc041bdfddb