Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea4c9568808b519…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 03:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c48824f83d6d096273d2f2c872088d3c SHA-1: 3131e40f5ee9126965560d47755e04c177c8669c SHA-256: 4ea4c9568808b5194ef3fb703177f8c570e8cfe3bb5c7cb29501c4bf364d83f5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ytlcases.com/userfiles/file/36287768567.pdf In PDF document text
    • http://fitviewer.biz/files/file/detuzozifuwoteg.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/vdmhj6ne2n4osd31m20q3g2i19/mudovituxumipaluki.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/26674550623.pdfIn PDF document text
    • http://lakesideterracecondo.com/clients/41361/File/64281673882.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/1beeaa357602e8da9355ca2a0e5ddf8d/gupowuserosezek.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/4613f4f810df5587b488699361bb8870/33393185709.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/3644901365.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104a44400150---166349315.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/20537e0cc52ce0264c2e7d9ce7da4f2b/miniboda.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/resalezibumikozuk.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///42050116720.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e06c72d1a9---nalofebodobanowokugij.pdfIn PDF document text
    • https://yellowstonewildlife.com/titoj.pdfIn PDF document text
    • https://ms01bet.net/contents//files/38400264661.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/56061524369.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/negox.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/21757151087.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/judanufolojofuwodinosasa.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609627aa5dec5---lipudosumexeli.pdfIn PDF document text
    • http://broeinest.org/ckfinder/userfiles/files/36579386315.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160beda88e3a18---weputibusawemisajip.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/8254150261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=engineering+mechanics+dynamics+6th+edition+solution+manual+pdf+free+downloadPDF 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_off0000d064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD064 17720 bytes
SHA-256: 65ff7d03e2f86a7efb86c4357a4af9d613846ec4526ae64cb768ed18d10da2c4
font_01_sfnt_off0000feb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB0 11516 bytes
SHA-256: c35d0fa6e6cd6596bdddd8c8ca5147bb72cc2df08aeee5f4996e464cbd249e4c
font_02_sfnt_off000119a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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