Malicious PDF — malware analysis report

Static analysis result for SHA-256 f748660fe0cc6cb2…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 07:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a1a299a2ff3892ac590253a8be03058c SHA-1: 9b9220d2d378896e158955eb1df75fd836b86303 SHA-256: f748660fe0cc6cb209c36bebd6800e684e4244595b5bd58388787b91fdff9ed4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.lircai.com/web/inline/file/49164225991.pdf In PDF document text
    • http://be-now.pl/userfiles/file/24148783010.pdfIn PDF document text
    • http://secoinblock.com/upload/files/rixazufanujofujipivus.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135118a201c3---66782514262.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/xegutu.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d783ba7b82---35002885749.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/pibenutixok.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/68777703354.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/68006795406.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/53015506283.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/bazarebewozefogemuwat.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/wiriwodale.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/sitokozoxanopetaz.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/9f3835c3c1bed8afa5d676d5a4562f5a/88747789113.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/zutemimemato.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/76731917918.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/kajekijexefizafexamozow.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/tabodawowowafur.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613599a7121cf---werexux.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/9b625d151a3985ac94976223acb0de2c/vexufosiside.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/zitokiduwuj.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/46771749907.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/68886407701.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/63603597330.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/molobosebekalo.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/15323754513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=watch+westworld+online+freePDF 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_off0000d952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF164 17852 bytes
SHA-256: 5722f03c80dd35cc71d110a38c6be793f781169988e8e199ec707bfedb4cc22e
font_02_sfnt_off00011fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB0 10652 bytes
SHA-256: 77ce3e2029d1f52d3fbac15b2e183e115a541a790e86ba1c30755057a7d7da09