Malicious PDF — malware analysis report

Static analysis result for SHA-256 5143ff43bcf15406…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 18:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c5bfbffee3890722b0b08cbdcf36115e SHA-1: 318d9fc70f43507abc5b679ddf7458f8d959101e SHA-256: 5143ff43bcf1540622a6f9c6a40b82ecf68b1cd8b5ca2723546e43124d3bd63f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS upload directories. The presence of a 'Download Now' lure, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution attempt. While no scripts were directly extracted, the overall structure and heuristic firings indicate a malicious intent to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://adria-ex.com/images/blog//file/19254304791.pdf In PDF document text
    • http://hrjok.com/uploadfile/file/gemivil.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75ad374a0c---fobipirepolem.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/161fa66c351acf641c93fb6f1bd84aab/potusirovizipoga.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96e54c167---10086150266.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/tomunatanolexalixaju.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/43362833819.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/rivazakapaziwerezukoka.pdfIn PDF document text
    • http://coffee33.ru/archive/file/bilakugiforezevudek.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/esi3aalg36p1asf3k27ia1s917/79080890827.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/xanosapodibutixatadid.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6e1087324---82807282668.pdfIn PDF document text
    • http://lucavolpicella.it/userfiles/files/34690202117.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/79475939796.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/bazajef.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/5001304622.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210904112651.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baed2b2525f---pepakefifejiwiragaxa.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/dudeli.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac14c8d4ed---koxav.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/wudosumanuribu.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0fdda07eb---9076957756.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/hgl1kfd3ra5hlje8haaoejtvu1/gisogusilamejixizakugi.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/18814188453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mppsc+exam+calendar+2019+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_off0000db4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4F 18964 bytes
SHA-256: 71a90741d1c44e4d88ca8dca0e78eb282d7b9e1765269370d4ac44bc65fa4c88
font_01_sfnt_off00010d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A3 11028 bytes
SHA-256: 300a04ef699f2c006f72be7466f72267b99680b27fc2b0fe1cb01446f6859738

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