Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2d99002999abcb…

MALICIOUS

PDF

79.7 KB Created: 2021-09-21 10:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 449e216d85e09887bfb81436dab916b6 SHA-1: 34297ba94a0713330a67302a1c6ed13826718a32 SHA-256: ff2d99002999abcb6effc872406e35d647ed63c206c750fda8b066ed8aca984f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to distribute further malicious content or phish users. The presence of these links and the overall structure strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16149573da8daf---84428088893.pdf In PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3259735cd---46456289392.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/9f1ff63d0790def098154c0ffd80be5e/92255186371.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/terejosajawixoz.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/52311314995.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/velid.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/61001936091.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/24401680550.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/7332100371.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/wawejapuguser.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/45702127360.pdfIn PDF document text
    • http://dejede.com/userfiles/file/poxumor.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/pibabodufigikimonek.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/65418331825.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/b2977cd6a46bffa5abfe0b8e31c5ef07/fabudegaterebumutivuwe.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/18610420493.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/miwufalofozofavudewomusa.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/32879773937.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/db5c26473ba485497455a4f725b77919/35343205234.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109072258243143.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/zomolepesevupux.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/sav6a8ll7necckcg0qgdmqibja/dezebilezalepigovo.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/pubudip.pdfIn PDF document text
    • https://www.hoodmath.com/gIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=papa%27s+pancakeria+cool+mathPDF 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_off0000d3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A6 10768 bytes
SHA-256: 07272ec578a715f2ae8a2917286ce30e213b84ce68518da6f781f7797c5f1a47
font_01_sfnt_off0000ec47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC47 17200 bytes
SHA-256: 9a0db9ad62b4501d3d3771591fc1444f166359b41ba3d00c7f5ba12563851e6d
font_02_sfnt_off000118b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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