Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b359e1665c6a352…

MALICIOUS

PDF

75.2 KB Created: 2021-08-28 06:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 20a926e0fae0366569a7b2c440094e11 SHA-1: 9a5ef8ad8bbda2ed4988bb478846a23e7e1f1fb6 SHA-256: 9b359e1665c6a352f45db194bd81d868719fa26d9becf4d2ccfa2d252e4e25b2
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of link farms and the overall detection results point to a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/54f9e850a03a4bdb06e4d40f26c701e4/68093201188.pdf In PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d1af24cdb---94881925342.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6132c36c57---59885849585.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/dotumexoda.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/bf4c1ecbf77d725b5d8873e122847b02/mibax.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/qvus0oocre8acel4clk9bdgkkc/serol.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e021faba68eccacb141f7003524fb73c/90743957378.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6bf565a4e144001a3f32118473ea99c9/durotuxuwapetel.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/67038260062.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/90970557800.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/96314109320.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/14258333480.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/07ldd2ajga9390h6kb9pntquf7/dapazawibova.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lepafiridobiriwaxe.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/1573926205.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/379704fa58409ca82a81e086b9a8d005/78316353309.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8f15ddbd6---77205277419.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4922d26610---46282945464.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/wetuniganivume.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/56d3ce79c959e76477845da98b327e05/joxupu.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/fawufidevukib.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d9393616f9b---kelijevap.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/991d2ccf63962a5f99732a191ea6f1cf/61315982655.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/nuxiludaguwave.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d46d865b8e---888831403.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/kevokimanukaritelobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=mortgage+payment+schedule+examplePDF 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_off0000c6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D9 14872 bytes
SHA-256: 336108d487170bc02cfe05196d99d292e6cce41237896c7cdf6c11f7ce606a90
font_01_sfnt_off0000ecb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C7 11180 bytes
SHA-256: 729059edf81ba65a3ac127cca2dbed04a50fb82af5d6c0ad7fae4e4e35f73602

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