Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f4764c94e69a9d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-01 07:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6788706621e518ce9baee3cc10c76a38 SHA-1: a3f9984793c2a2d83fd6d2213de70874056be943 SHA-256: b6f4764c94e69a9d4d51b3c5f16c376a59cc523c504b2e893ededb62db6aa1ae
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external malicious websites, likely for phishing or malware distribution, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://pixomot.ru/uplcv?utm_term=right+sacroiliac+joint+pain+icd+10 PDF link annotation
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/ohcaoja01cugvvq3l7mkl2ps8s/32234669158.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8a69eb4498a4cc9e606ac27db5aec1be/69683090132.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/e286b9f925a9ec81b61909b3578d55e4/99579288499.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/konevekira.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/61602194166.pdfIn PDF document text
    • https://combrooncom.com/contents//files/virimib.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/31979458738.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad85bc22bb6---79969197892.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610cc249cce22---20549582832.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3bbf29903d---benab.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/90732159351.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/e958f7b1d4c5093ee769b2d94839e3fd/76195319067.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/nobopakijafurevozin.pdfIn PDF document text
    • https://tdsns.ru/userfiles/file/38020619993.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/b9melgrnd2205crejug3nqj1u4/95957735998.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da41aad8ef---19757441439.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/9984560599.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/77204714196.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/lusunogogizuv.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7a868b648---65871515715.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/2a20924a7741336d8275cbd039c53037/sozojomi.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210623_195435.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/rewatojuvipabavodavixo.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/a218f1dbe54959943ab4ad987ad50e9d/luraxosamexuvipov.pdfIn PDF document text
    • 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_off0000d60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60D 16496 bytes
SHA-256: ae35c2eb8f2d24ced3c3c309c3d91536f427d67a9451ae601e5d7c7d9e45d7fd
font_01_sfnt_off0001008d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A4 11008 bytes
SHA-256: 42d26002d36933c37709245d32eaaa323f372c26aa783a7a9c4ccf77aaca427c

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