Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f6cc6b2e3485e2…

MALICIOUS

PDF

75.2 KB Created: 2021-09-03 03:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 14fc336422b098fe830f1753e8e14dd2 SHA-1: bafd96d9c84b02c0bc16c7e4164a761bbee17ab8 SHA-256: a7f6cc6b2e3485e2a162cab1eb2f0a067674f884ad860e4bf826585876282439
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/fd6d926245dc404528a738dd6028217a/70741631323.pdf In PDF document text
    • http://nitexprofi.cz/userfiles/file/68130808668.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/21037447408.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4d97aaad1---45620540239.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084480058ac5---gofumegis.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/12450658274.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c1905f317---42954164432.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5fd8b17ec---2202670157.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/38d0a0bfba34564180d9fc9bc7f718b8/labunuxunares.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/23412584144.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ec107fe194f18582cf1d0809e2989646/12010292164.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/632d5b5pr5dpgvs96e34qjo5e4/sexapi.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210714152136_zwi4y3.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/22338734727.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/813028c71faa099fc6776e6eb8c202ca/gijal.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/paxerufizelixobopix.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/1s7j4e30ol9airdeqs8geq0985/rivax.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/rebivezokobovezoripapiku.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/73612247344.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/42189355138.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/11561364573.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/75898493282.pdfIn PDF document text
    • http://foodchemsino.com/d/files/90419674492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=etre+and+avoir+worksheets+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_off0000bafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFE 20500 bytes
SHA-256: 4d3a909a8c5628992e0afc5e551c45d262ec07cff8274ee9ee5d5551cfbec247
font_01_sfnt_off0000eed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED2 10776 bytes
SHA-256: 90500286c2d26323b9d3238fdc8f72f600aad5975cdc845f05e1e9e7e5008a0e
font_02_sfnt_off000107a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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