Malicious PDF — malware analysis report

Static analysis result for SHA-256 35bd7e4f0df508c7…

MALICIOUS

PDF

58.1 KB Created: 2021-08-16 12:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 35442688017d4ded0e7c95cdb5f62fdd SHA-1: 60987d74fc92df9f886aeaf7b9655e259c922f8c SHA-256: 35bd7e4f0df508c7d34ad18be1508800fe66713cd31229e768cc484d6b1ff0fc
94 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on various domains, some of which are identified as potentially compromised CMS upload locations or disposable hosting. The ML classifier also flagged this PDF as malicious. This suggests the document is part of a campaign to distribute content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7775

Heuristics 4

  • 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
  • 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://terminarz.online/kosmetyczka/krakow/files/63628584917.pdf In PDF document text
    • https://aulacvn.com/upload/fck/file/bopewapanukinemukimipuwuz.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1623092229.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/36643410618.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021052521221885.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/janidigiwomenudobe.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02f338a3a5---tinofinoledajajezure.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/31574841568.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa3ba633f---900917932.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c6947dc4e9b---87294136037.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/41c624542973a8cb086c312d63256e25/negusaku.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/nqr98pe05jgnqrlltq1dudogs0/93545707506.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098bad497b58---sovusevidivobufiverodi.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/367429550.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/66232500140.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/pixogazosekagofafaf.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/28570dcb9527598928dbc6262c8a9b25/89204659597.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/90865307952.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/ug7l60l7p99d5kag5qapsj8hqm/11014507955.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bef5cb9c632---juxalujabinavimule.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e6dd9acc7---74808018589.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/954226a71bfeedccb4230c041ad74741/48256740792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=speedrun+split+timer+onlinePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D6 16576 bytes
SHA-256: f859dca13e6d8fd1dc988bd33ea4f3d208dcefe34aa2197197779a7b42fe9297

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