Malicious PDF — malware analysis report

Static analysis result for SHA-256 cffe7f07599e1f81…

MALICIOUS

PDF

83.6 KB Created: 2021-09-14 11:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e8e4b4206f41d76976c168c5ace370bd SHA-1: e3f643add8a39898339b9adbf8d0843aae9573bd SHA-256: cffe7f07599e1f8164682e633846c8d066eb9f564398a3ce37f4ef97c88c7854
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to manipulate search engine results or direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript likely facilitating the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://wedooverseas.com/userfiles/file/25979875330.pdf In PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/96804520644.pdfIn PDF document text
    • http://mp-journal.com/media/file/wogokivu.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138f6bdace35---2193243448.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/17417001415.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210911135445.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/desekalivas.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/77759605891.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/nomijumuvegirudubibidodad.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/kikowodarisediriwujep.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/44844223483.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/90106398270.pdfIn PDF document text
    • http://whatdwellswithin.com/file/91642801125.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b3441679e6ff4b550d7cb2af595884b2/2436559809.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/91858419979.pdfIn PDF document text
    • http://ping-property.com/user_img/files/78872713232.pdfIn PDF document text
    • http://scantech3d.com/files/totuzigofo.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/dukurivili.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/83384661435.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/80587036828.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/sigagez.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/65187323830.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/rizipiletogegubetejegijum.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/d0ec6e11635208ba576532c9039f3429/bimigav.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/30172766713.pdfIn PDF document text
    • http://novafish.it/userfiles/files/mifopodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=best+music+app+for+android+to+download+songsPDF 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_off0000e11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11F 11204 bytes
SHA-256: 3640f03b0ac8e552b7b6beff695d5ee7b353ff57289b93299fbe10be5d2a8e2b
font_01_sfnt_off0000fb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 17564 bytes
SHA-256: 80ea64251453dc1b3d65e728afa4171d0c3492e6ad59d2bc3efa5482f5393ac6
font_02_sfnt_off00012839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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