Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e49b7f098348a7…

MALICIOUS

PDF

75.7 KB Created: 2021-09-16 23:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 89012f607d6edeb556069ce34c0ee4ee SHA-1: e7f290fb72ccd169b5b637bd72d3c9d7d41bb5e3 SHA-256: e7e49b7f098348a7af0fcc44190a35b88521c84777a9c789aa7a3feaca7546da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=android+tv+for+iphone PDF link annotation
    • http://bienbao.org/uploads/files/mewesupemenebazitizogib.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/58427223430.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/gowes.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/mawadofokofek.pdfIn PDF document text
    • http://thaide.org/userfiles/file/ridugademem.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/53142057352.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///jenodatejibav.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/89503247531.pdfIn PDF document text
    • http://didopack.com/files/tovawemaretotekonega.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/safovatuwexureko.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fad95dc65e---93963429074.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/88533912150.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/tapuxedosakaperekabil.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/dagefesizibirekipoke.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/fodokopusanekol.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/tetuliziwilifil.pdfIn PDF document text
    • http://kes.org/upload/editor/files/57378171338.pdfIn PDF document text
    • http://planetamama.ru/files/file/vugebenuvonuvuzesofu.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/cde235f29935d72674f46226ad6bab21/75269874614.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/rasadoxeredusufosari.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/rivurunapirexodiloro.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d3464d177---zuteku.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9aab2d60f853a727996b8184c1234e51/52857696111.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/seguxabesukorerokam.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/90228997279.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/jebetefudubufunababibeg.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_off0000c826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE038 16344 bytes
SHA-256: c5270d4bab940bf57a1ed91f0a7879df8ff1ef20c26021e6bf3b002ae6178468
font_02_sfnt_off00010a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3D 10268 bytes
SHA-256: 6bf424d6034b20fb1f67c6e2cc7b0731c822e32f972eadc20407442849f2cff8