Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7ed61e9cad951d…

MALICIOUS

PDF

72.8 KB Created: 2021-09-20 03:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7d0b33c5fe89cd100c5b529b9750880e SHA-1: 595606384f8678b1f585643b62c65233b35e21a9 SHA-256: fe7ed61e9cad951d85ca49c237770e98a02e7b617ea81de25cd19366e6ebf9bc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected by ClamAV as a phishing trojan. It contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristics indicate a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to obscure the final malicious destination. The embedded JavaScript and numerous external URIs strongly suggest an intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://ketchas.ru/uplcv?utm_term=the+art+of+assembly+language+2nd+edition+pdf PDF link annotation
    • https://jpjplumbingandheating.com/FCKeditor/file/vubepuseteku.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/sisilezuvonugogudufagasow.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/30966442807.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143da971105b---tijalurijib.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/88169847742.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145c8c5eb16d---34689301354.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/bivokufakuxo.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109131430117920.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/kusem.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/97034633379.pdfIn PDF document text
    • http://mousike.it/img_ins/files/fisazogeje.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/10241712929.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/tilam.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/84251570832.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/51289365633.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/nafikomubupawijolewusal.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/wajoludinuzudijel.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/kerudirepag.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/rulubezerokerinoledujaw.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/54650665618.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/78010700307.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d58a6a0df---76327783786.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_off0000b594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB594 11384 bytes
SHA-256: f65829c8eadba245c400ee12533c4093f62ccd5a16b0d83f53bf6bb574cfddfb
font_01_sfnt_off0000cfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE2 17656 bytes
SHA-256: 97e72e84a824f3b154d951da25254c85a75b16d53ce9dbf5408e28f13e6c9edf
font_02_sfnt_off0000fda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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