Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a58de221187ffb…

MALICIOUS

PDF

70.6 KB Created: 2021-09-05 22:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 800c00553f911b8a254e33783c3769ba SHA-1: 1ce1ca9531402251b3a5b057c4bebd5b26c1e989 SHA-256: 25a58de221187ffbc4a1cef733e9ca1cc8e7ffd4887ddd863a00c54375686522
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The file's structure and the presence of many external links suggest it is intended to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4326

Heuristics 5

  • 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
  • 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://medvor.ru/uplcv?utm_term=exercicios+de+cinetica+quimica+com+gabarito+pdf PDF link annotation
    • http://apple888.vn/luutru/files/zuwibo.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a6a1ce0ec---gonipiw.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/34692177317.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/1dcfa2f6b889530d62aa8bf8080b8dd3/26706258555.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161341abaa51cd---94368668868.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/nadetasitovofokiwaziv.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098083b8255b---64955038696.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6937707a4---tebasez.pdfIn PDF document text
    • http://ausafe.net/images/art/files/rizugozinuzode.pdfIn PDF document text
    • https://dm288.rs/slicice/file/38587351823.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/bajinipimidaxowefi.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/bijerorofavibolumezugixo.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/65554621169.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/jujimadewofepudafo.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/lemilosarakezedi.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/parusomoxalukab.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee798d9350---fezotapamutokezogi.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/83688231398.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/79057bae51fca34f5aac632710127b64/64931503304.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/82250617710.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/0eb2b73ef0d377623b9e1a11d08741ec/90073347330.pdfIn PDF document text
    • http://immopolignano.lu/images/runuz.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/71295986614.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9C 11388 bytes
SHA-256: 9e17218ee01d6a9c3f5ff4819ad7b91fdb965215eb8631dbf9102e7a3cb05344
font_01_sfnt_off0000e5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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