Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b086037b1a1c4e…

MALICIOUS

PDF

97.4 KB Created: 2021-09-05 17:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2fdf73256ac81fde9ec92173335b736b SHA-1: cbb841566bed9063ebf3a20938628ab97c8fd979 SHA-256: 39b086037b1a1c4efa41ca375451a5eb0bdf9dfbb8a930a3a7ade09491b85218
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery through these links. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160833a2373341---81407219005.pdf In PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aed8a93cfa4142f29a56bdc8b0c3d524/sizolujevositozomisugefek.pdfIn PDF document text
    • http://cjatkinson.com/userimages/depuzadegumiruboxegelu.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/11867991317.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cac76a27c9---boxigozan.pdfIn PDF document text
    • http://www.asslar.de/downloads/ruxixodonomafaf.pdfIn PDF document text
    • http://jcpingie.be/public/files/mopujikelitutoku.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c2972af0c---41775328241.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/81374252652.pdfIn PDF document text
    • https://ekransamara.ru/files/7539547057.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/19706853980.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d03a9e0ab0---tovawaraxadisa.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/5b12b0b600e8025fe35fad1b2df73861/57369075182.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/f696e5ce4fa12269cd9e77982910da8d/bekamonolaxapomamaxi.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1611b082d34c49---larid.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/40036491960700155f9c3ef047dfe5db/31767221015.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/ee5867285ce73ed65bb2e70edd0eb16e/94651149680.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/74137801427.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609837f90058a---febubadufubixudodogag.pdfIn PDF document text
    • http://calhi1974.com/clients/46234/File/61206282768.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/32679331183.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/bisugasofugariwefesuvase.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cc848a0d5e7a31afd4a4455c3579de49/zakoruxatono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=much+and+many+rules+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_off00011718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 18272 bytes
SHA-256: 2eac24c52a929ffcef2427da9b17ee096dcea6fb6ac767df6e7786da2e442b73
font_01_sfnt_off000146fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146FB 10780 bytes
SHA-256: ae952a1e223fc08ca04038cbc64d68916ddc6e634135f709184a93b8a7dcaf73
font_02_sfnt_off00015f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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