Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e94cdee5f378b64…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 22:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1751f596aeac6ae720f1226adcf6fcd3 SHA-1: 666a7ceb56c1ba96b7e271e0736e9bc4bb7db5e5 SHA-256: 3e94cdee5f378b64c7dd8a366be828d7c42094b8fb05ce3bd3a881d1017d95e4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The primary goal appears to be directing users to these compromised sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609835e7891d7---76313169626.pdf In PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/46206271227.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6793d4d55d---26003674718.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/26b70f7c27b7b641908f819bd309bcaa/45061648940.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a34c14193db---82296962429.pdfIn PDF document text
    • https://mfdesign.hu/files/file/631842857.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/c42fbe29150f2cdf1919424bda690789/rebafofefazifunebirotinaz.pdfIn PDF document text
    • http://esteel.my/userfiles/file/gepofelukapesawibexe.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/wonuvuwelopavovuk.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/43017346850.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/40514479523.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f02e032c13c---75496805980.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/20981369514.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/28982732659.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160feef453c5cf---86009284180.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/gad5g774ku6v6dhlqi8u5f27u3/nejafosewalerajimaliz.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210630_D5287F2C59F7EF43.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/tesilobama.pdfIn PDF document text
    • http://elskenecologie.nl/files/79153508806.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/3641932206.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/dc0f1f0ad29af7dae88e8681316c3168/44011058772.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/ripanuxukewamovaseturixuw.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/28888128366.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/mupakomalamifiwew.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079883727103---73995024919.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/59692652863.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a953045f6ac---78486047647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=nari+humayun+azad+pdf+free+downloadPDF 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_off0000c54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54A 17448 bytes
SHA-256: 80edc6f7e50d2fcf72e811e34275275fcde5c61c3158dc3f188c3064744aacf3
font_01_sfnt_off0000f1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 10832 bytes
SHA-256: 383650ee1a9c65cc15a0e61f817a32f07b0975669b06f4cfdabf6990eafe2126
font_02_sfnt_off00010ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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