Malicious PDF — malware analysis report

Static analysis result for SHA-256 862e6efa11aaca8c…

MALICIOUS

PDF

87.1 KB Created: 2021-07-22 10:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e46dd65311907da94f3975754491e09d SHA-1: 656c4ed786a2a80c5a8e5542da28acfe3e97cffa SHA-256: 862e6efa11aaca8cb1638c3010c96ceac2d1bbbc423beedfdcaf4d1e41309994
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable hosting. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings indicates a strong intent to redirect users to external, potentially malicious, content. The ClamAV detection further confirms its malicious nature, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://belgium-ex.com/images/blog//file/22111994630.pdf In PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/9gkf3f2ic4l61ih8bds3u6bo3f/gexubuzububevoxes.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/renilirafegex.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/39306099625.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/92750422060.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021051811124838.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e5df9eeaa---61041661716.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc91eb7880---41209053318.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021062109430070554.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edec848b47---22050057490.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/5863f076e589a3ba3db1d45de5302710/25561853069.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca22358505---tunanowosegefip.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/0d0jogdh7h11bvpij5pjjd75j2/53068182347.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/jipunotegugadegos.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1634643c36---pimezave.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d79d0f0ee---43501937457.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607603722e662---82099453990.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/segimejakegit.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/58085062635.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/5e500ce0e220edcf9503656f03f4b3ab/govedogijetunarixigevixo.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ljmadska3r32chjrbfe2at5k5h/675414555.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070dd7b4aa88---juliz.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/68ab592751a960ee548e285c4eb564f8/26386292613.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/94726400985.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/wajuzuwokar.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/6c9f1051bd5520a4df5dd6cfce4e3b0d/muvaferemosuwevawotipeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=logic+and+discrete+mathematics+a+computer+science+perspective+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_off0000eef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF3 11144 bytes
SHA-256: 5308a3c6286d818a6c08d1f1eb97566f8ee8b202527d15b749ac619bdd7bc9a7
font_01_sfnt_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 17516 bytes
SHA-256: 7872dcd429f33a5f43c225bd6f6a31a1fbe8453cf70118ce1bcc4128a21446b9
font_02_sfnt_off0001362d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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