Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23e1f37368039cf…

MALICIOUS

PDF

71.0 KB Created: 2021-09-03 02:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 290251d0b7d336ab5ed0e6005054b7f0 SHA-1: 72f84409d39c8484e81f3c568de626e6d42d76ed SHA-256: e23e1f37368039cf2d57b18bd430e78216445a3023fcb0b2d650e7b5b7011db7
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to websites that appear to be part of a link farm or hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results or track user clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://forglory.cz/ckfinder/userfiles/files/10065869628.pdf In PDF document text
    • http://aygroupmuh.com/image/files/10635502928.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/62694002675.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/69509105952.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb11b8cd1a---budebezuzemo.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021731242555017.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/gezajab.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d7155e439ef---zilizanujinejasesinavexix.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/98699628494.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/gabagewefevaruw.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/qtf98gkf3nbak0mvqp60n139ok/kopobowubodaputubavit.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b5101e862---tosojan.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93520797740.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/2a76623e35e666d4bc4df99b3ee21be8/taduxufaliroro.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/20081040430.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868d6563495---barerixefaf.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/62563138092.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/bejowituvelamonukob.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/39982246074.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/200334488844.pdfIn PDF document text
    • http://qca.ch/userfiles/file/12092473535.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/83297769448.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/fobisoxedamevatufow.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/kinuraxikagaluxidev.pdfIn PDF document text
    • https://renetravel.ro/images/files/pisopasozepelevazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=traductor+pdf+a+word+onlinePDF 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_off0000b57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57E 10592 bytes
SHA-256: 42e289adfc77b2bbff4b895b5eb643c3328d9069815a61c2c22424f1cac604ac
font_01_sfnt_off0000cdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EB 15324 bytes
SHA-256: 4cb9978d2e47b16bc36dd01c44bde34c7dd93c5dd0344ff5c5eb6b46c3442f3d

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