Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4417a6a0d79951b…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 14:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ac8d3201608697033654731dea7a3f7a SHA-1: 558e61ed7c70c9c1de724ea54ce7ab629a2fcda3 SHA-256: e4417a6a0d79951bacafb7cbdce1966b4a9fbb567998f0dfa8bd5ee56ead31a3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are hosted on disposable or compromised domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the presence of many external links and the heuristic firings confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://palakkadtourism.in/ckfinder/userfiles/files/70944022993.pdf In PDF document text
    • http://cwesp.biz/upload/file/22709897387.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/78003909000.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/41327017241.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021081112384973499.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/wofag.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e321316880---42255791303.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/tudokakogelara.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/32307601076.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/996pb331bk6gk32crffutmahj3/vinugidug.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16092c454a1b2f---zovixoxi.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd4af86a44---sanemowenomirelanekafi.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/jeguwavomixibadi.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/93173453975.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/93d4f1f78956e36954d51620a2c90c09/tukizikakupunogobokosirag.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/36976149275.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/8967762829.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/543d546029008523bebe86e988549d3b/12110029567.pdfIn PDF document text
    • https://baongochoa.com/upload/file/gugasebiwibufofoxewo.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/374b701730ce43df6ace77efb21828ca/55694843196.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b412a5e34---fezitiminu.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/gikikowufikupalojejemo.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607027bb64ed2---32803279842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=educational+psychology+book+by+vamadevappa+pdfPDF 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_off0000e2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000face.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACE 18080 bytes
SHA-256: 8783ea2b7db5c73657ca0b09f657c0cd3aa3135f8b6c48e8594831b0d7765377
font_02_sfnt_off0001299a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299A 11460 bytes
SHA-256: f99a3e7951010d1d861e871e401c1fe86342dd78de0a054dbef3475809ffc359

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