Malicious PDF — malware analysis report

Static analysis result for SHA-256 09bbc71af52df777…

MALICIOUS

PDF

68.0 KB Created: 2021-09-27 01:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b9ffd2d72f98f7f0d5ee0964c33c0ba2 SHA-1: b51feb84866dcdb598024d0b8e99400deb8c7bc5 SHA-256: 09bbc71af52df7773c1ab7e3fd1aa30252944e0aa089162d3134ae54f01cc8ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and link farm heuristics, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point to a malicious link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://pixomot.ru/uplcv?utm_term=bus+simulator+ultimate+hack+for+ios PDF link annotation
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/8c0gqmlgr2ted9hglfrimeoh31/55045548094.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca18f74420---ruparijujewidider.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/92687959747.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/jevadixuwixiwalirebe.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/limokizimonomin.pdfIn PDF document text
    • https://combrooncom.com/contents/files/vefomujetisufejulorowinim.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/98943276781.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/49896766684.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/766d2f580e186ba0671fc1a2beb66d82/befowodijad.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/fefawalaz.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/33234394856.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c72aec000---69151274787.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/49484578561.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/62895945372.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d6d7e2923---86650222604.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/63740990628.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e8ae5ae01---93404364754.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/20145892696.pdfIn PDF document text
    • https://people11people.com/uploads/File/45272662687.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/44416612823.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091815494873499.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/64001579953.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_off0000ad5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC570 14492 bytes
SHA-256: 51015712552263b28cf0aabd33e32e4b01a7de960a0ba8d6767f79e08589fd86
font_02_sfnt_off0000e9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B8 10740 bytes
SHA-256: 9d7670289b65af463242403a36cb4ce4cd47b778bd2dff392993f1eea9e7a04c

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