Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4675ff09b679f5e…

MALICIOUS

PDF

144.6 KB Created: 2021-07-07 23:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6d0285557270cf46d5d967680849b936 SHA-1: 2aa7626c70c60c80d6b3640096bf947048c4996e SHA-256: b4675ff09b679f5e42d58021ffaee96d5074468c80da7b90cb6cf9a59e9dbd01
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress installations, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

Heuristics 6

  • 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.
  • 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://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/3edcb75d0e233dc09771e4c972843043/jurokefujujegeseka.pdf In PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63b68182e4---48056563562.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/sanofa.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c8103d84f4fc2d2364f0e3f14b99f2ca/bowezisaxez.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/vesig.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/ushvv0qvi2o5dov4v8huah09du/ninakogave.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/b31b2a02753ac44c97f7a4eb16a9fc1b/47605219971.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/716863ce1c1b47a1c8336b9f119c1ab1/32981637364.pdfIn PDF document text
    • https://bjsteelvietnam.com/upload/fck/file/57965140948.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/fotoli.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607032848b3f2---7780167449.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/52587579121.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16081c01376717---6840482575.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/ludetefusejukumi.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/6qluvgl4pqdpp2bp7g43pqbgj0/jivebukudamerejuv.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/venogu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608346b82e1b0---paton.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/18296765199.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e4b041384---porupolefeme.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/82270692395.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/7fdffbfc68859b86ff779dfa9fe4585e/lepem.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/nfpgr7v0ng544jq0agmclgla69/mifirisukorizilape.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/s8i7h4dp3cdg7f2716qt0lk008/nomewafugofevibelujuzak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=one+punch+man+original+onePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CEF 43024 bytes
SHA-256: 44f9ca6a4c76786a3a0ca3c7913c37e44a0886426eb1294db738d26aa5d74148
font_01_sfnt_off0001d4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D4E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ed00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED00 10680 bytes
SHA-256: 5278235c8c4f0de6180363854cead7f6c1a1fc5691d1fea6eaec3f67053d9d7c
font_03_sfnt_off00020536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20536 18092 bytes
SHA-256: a7ab0dd607e6e99824f494e5e16850c8c10a2cbb04a2849bee06422e8236e3a4

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