Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f98647bd7f49c84…

MALICIOUS

PDF

78.9 KB Created: 2021-08-28 01:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 25e86bea22226e32f65280ff0b0315c9 SHA-1: 07696624a438c6a4a1673c50a6295557cfbacdc8 SHA-256: 2f98647bd7f49c8429dccac3e15cb4f87eca404265fb7441cbf6590ea5e010c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous URLs that appear to be part of a link farm, hosted on compromised WordPress sites and disposable domains. The primary purpose seems to be directing users to external malicious content, likely for phishing or malware distribution, leveraging a link farm technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://nomylo.ru/uplcv?utm_term=yorkie+and+a+maltese+mix PDF link annotation
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2dd0ce30---96429782981.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ed83b544c---gulosojubuvukudixipaxib.pdfIn PDF document text
    • https://signika.pl/Upload/file/fogowagogebufopo.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021070813434273499.pdfIn PDF document text
    • https://oksushidelivery.cl/sitio/public/files/file/widipopatejewuru.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/27756111185.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/ded8124514e8a148be9ae7b5b4c7fc0b/77719192480.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b130f713a7d---sirak.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/44862062208.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a168099329---luvofakamodenomamofakagom.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/jubevojepivaxavinovam.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/63620204584.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e6ce4acbea9---12555732305.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f626aa002---26372298318.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/44ab1f7a51ebf3a28207a1f63c1ea18a/87977495508.pdfIn PDF document text
    • http://kccmaul.com/files/files/fewugelefox.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609dba10c2d2b---ruluribosasopixidugenu.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/3813913148.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/guwipusef.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/33313352647.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/6175123526.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/gupawujatonusejokomesebox.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/82306959072.pdfIn PDF document text
    • 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_off0000d115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE927 16984 bytes
SHA-256: 7c49a7f79082c61904a0b57165433d8297e42aee2bce17d8a2b587107ee6dc3b
font_02_sfnt_off000114b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B6 10588 bytes
SHA-256: d8eac63cdfbf17237a9008b972b90a3ecadf35b4785bb4eeae0b192b4fa2bd51

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