Malicious PDF — malware analysis report

Static analysis result for SHA-256 387fe7753dfea6db…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 21:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fd08f4c686d275940e0e69ba46c23a01 SHA-1: 1a29e3bbaac50906a3b1ed3ee7817088f7822ef7 SHA-256: 387fe7753dfea6db194deb4cccfa07d90b37a3bfe06bf17ec63c0b2e9372d970
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious campaign, likely using JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://inwebjor.ru/uplcv?utm_term=comment+signer+un+pdf+mac PDF link annotation
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092447aed999---puxapivo.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/cc9e568833d4cb902286403b6f45313a/86495222727.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/84126541911.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/pukutitobobo.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/bkik8s78u506ddme9bdvepk6m0/71955708482.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/xuramirawokosafuz.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/44659323041.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/48554881010.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc90ed3913---karebefakifoxasatonabug.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/5e1cf3ac319d79c46c7657a24f6621a7/27616572918.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/19297305b1ed6c8a3e2dc17bcdcb7dc4/90740962053.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/39177147108.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/xebizagevozebadajefo.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100a9ad31fa8---37829421035.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804c8dd5d61---43908095382.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/tamekamulobizuj.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/9cde590dd83df33de30b0779e26ab4e0/silifusufetugebaz.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/mudejefazixasodovafeliba.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/nunalibukofoxogofevasanuz.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/19244039909.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/votozij.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a28505ce76d---lemunajitomupam.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/58755563759.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/1b637b7dd34ed9e42c4284f5ba35aa0f/93112984771.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_off0000d9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E6 11048 bytes
SHA-256: 9a4a319b8fa1c669b8c0e0825ade502f64ebe1cc39204ad94462fea1a8df7234
font_02_sfnt_off00010b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 18676 bytes
SHA-256: 386f8a5918bb789f18a673bb3b0a3fe9a8f60ec87402017143452051d5dcc492

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