Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3797f7aefd7e5d0…

MALICIOUS

PDF

85.1 KB Created: 2021-09-02 16:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 123b5ae5bb96afc56081bc5010362215 SHA-1: 9d6df97b0dd78f9e82ace73b58306e84776ba094 SHA-256: e3797f7aefd7e5d05b9248d72399739495135eceb9cb5c1c614ff6405934c512
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://shuswapladystriders.ca/userfiles/file/gusaguxiru.pdf In PDF document text
    • http://poorclarescork.ie/images/9174506107.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/jatugotapozebomax.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/gapipo.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/ledulamudu.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/baderozubaxiloroxiwilot.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/bth0u363bmmfvbmstvluteuvd2/44129226463.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/guwenokinutezil.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/lakavovupu.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/b366f38e0812adceeb73a53074ebc3fd/89790441507.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/20012079738.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/52633462547.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/u83bvp18dt7fcdeovbr5opp0e2/gularubifek.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/48174831411.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/dabibosisagapuzovivuput.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/26133589384.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/subilimiwukojodijivitafob.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db955a1438---damado.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/volebalixanugapa.pdfIn PDF document text
    • https://unaizahic.com/Files/files/70922867225.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/81328902765.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a113efb3659---41994212119.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/971c263bffa71951c55cfbdb125829c8/punupovike.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/22047230105.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/jesiwele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=benchmarking+journal+articles+pdfPDF 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_off0000e5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FE 17920 bytes
SHA-256: 40948d01ee72fdc2d032fb4c423dd8ae067b12318340e36735c4d22ac173204d
font_01_sfnt_off00011452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C69 11444 bytes
SHA-256: be9b0b68bcd42d461b889e98e1c1d0c92e7bcd5192448d1027a96279909ee128

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