Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3479389fad2dd00…

MALICIOUS

PDF

77.6 KB Created: 2021-09-07 18:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 31fceadad652a8190967a0cb965930c9 SHA-1: 59b7fb6bb32a60698660d00f35b7a7b130ccc919 SHA-256: f3479389fad2dd00d8c4d0efab2cfa58c56b80e469ba86612c71d452c9506900
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, suggesting the primary malicious function is to host or redirect through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/9qkhtkogmp11fjkvpmp2v2dukh/42551234560.pdf In PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a66dba7b852---66222504296.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973b96741c6---gifabinisusupaboxi.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/pukuxir.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/32147468346.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/61957843789.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/719c8bf960fbf0d55de797b173fe54ea/xefusalekajafamakinexuna.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/46148382278.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///jisijogomajaso.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e223665102e---49127846830.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a606917cdd7---vepuberewufijajomixel.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085433341ba4---85960384529.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/xedipowo.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b169eefaa8---ratidesezasaposew.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/becd9baea6529016088a811a7cf80d5a/32452969576.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/58540627637.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/pevuxomomovarepinebe.pdfIn PDF document text
    • http://24cvety.ru/upload/files/88545642506.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/febugoreb.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/gomudegudazirukabuke.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/8814507337.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/fumurumeboxizijopetewamat.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6185c9512---20624838831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=programa+escolar+de+mejora+continua+ejemplo+pdfPDF 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_off0000c66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66F 18916 bytes
SHA-256: bfc952b2781669b6ea9314038422ce751d3f0ec32d3d3a6387349ad5583c25e2
font_01_sfnt_off0000f673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8A 11196 bytes
SHA-256: 2436c8b39ca096cb471f790792419b91e3448bc0ab421cf272c0f5c2cd40205e

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