Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23f47cef5efd668…

MALICIOUS

PDF

76.0 KB Created: 2021-07-18 11:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 73197dd1be1c657f7b41da3561e6a572 SHA-1: f4cae061c0faebe3dacd65b0b44e5e76b7839595 SHA-256: c23f47cef5efd6680a2d1f3ed67e3dcdbf838faee9c62ff531939b0bb368a152
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2e58a5ac3---genepasezibodoxodixupofex.pdf In PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607461c1b2398---rujuvajakotepuxanesuzu.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/1901563750.pdfIn PDF document text
    • http://yuha.be/_files/file/kijezugawumusun.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/pumetikejekulufubovov.pdfIn PDF document text
    • https://clinicscrm.com/img/files/zovedebikotokazebejixolo.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16090a5605b754---49314091278.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a6cf848dd---35671688321.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bc528fa446a---pazusaw.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/37360630120.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/2357407e4534f0bcb9e92e2678b17d76/28806223717.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/14624555314.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859db302ddd---76355383322.pdfIn PDF document text
    • http://chikatere.com/Upload/files/6180073370.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/memabakazudatorev.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/vagivumonege.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/warunokub.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/793b3fe5924b3053179ecb0eed5f0649/ledisuramekirosib.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/58k8pkqs55h0m5p5i4k805qh2k/56195441235.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078465a5a04b---55176115351.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lidofabala.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876d07228cc---sajizivabekezolum.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210510/210510112604825216g2xg4jsjmy2e.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607858f344c1a---voredomuxafuzimanuj.pdfIn PDF document text
    • https://avela.md/userfiles/file/23676267253.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/e2v5i566ljt5r0iffkdl6vrufb/15840354444.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/dapaxakisibagid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=another+word+for+hoodlumPDF 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_off0000c66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66C 10364 bytes
SHA-256: e352938d191e98b5234c58208375b542f5802a4bba2ba53934ef9c42cd76157b
font_01_sfnt_off0000ddaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAF 16696 bytes
SHA-256: 1e47b8e5643fce978f277d00adcfa0f204f9bc2ae4a722f8af544fbf7bb1be46
font_02_sfnt_off00010961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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