Malicious PDF — malware analysis report

Static analysis result for SHA-256 af99277fe4240c78…

MALICIOUS

PDF

71.9 KB Created: 2021-09-01 10:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 26ce3ead7ed5cf2e1f4f602588dc5428 SHA-1: f5d5ca95d352255005f1d52bcf22d1669027ac57 SHA-256: af99277fe4240c78797ac47477c4f439983f77e13b231955c8da4f6b23c807ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wendi101.com/userfiles/file/vusugazetezoziz.pdf In PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/058dc6113eb4bc3bff70d16a9815a4ca/2668800886.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/a5bbec5dae7659414f8e85fd0ce03306/sixoju.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/i7p1sa7hkt0jpp6goq2s4haf73/siwusabetu.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/7532dc06653ce68788d6ab55a6b764cc/vopak.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/raloremusosaxenepa.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/rofebokozeje.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/fababezikitemi.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/rebereje.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/77336705661.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/5d8530e777802622737db93bebe0e4ea/24581779350.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cf7cb952a---xozaramoparugekawazo.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/671eab0c6c31829433f8c4e503949cff/muraganaripo.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/110c69f4824ac8ff145fc3f2ba914b40/79507926910.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ff7c8183e3ce724f2a5056729dd3f8ca/tidud.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/29665822924.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16097656786622---42118657756.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/94448570536.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711fb7b5676---58376482457.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/bugoratamidenisikuxomo.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/a9d91ea44c05a7ca7056d8840efab036/wakivajugoku.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/toratixikurufesofirefives.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a329f4319c4---3407327952.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/79225479275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=reactive+paracortical+hyperplasiaPDF 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_off0000bae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F7 10592 bytes
SHA-256: 0e9e57955a49aff54d0fdf336ce39950b69994dcc43f195d59984318910e9b20
font_02_sfnt_off0000eb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB54 15548 bytes
SHA-256: 6e4cedb7e13de0243ecbcc84dbceb8d4e082e0ec06abd0254af219227250ad50

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