Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eb87b0cb3de1d83…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 21:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a2182a03df17adc00390fdbe8c63fc8 SHA-1: 79ced03be6bc2b968c13de5fac114ac83110f00a SHA-256: 2eb87b0cb3de1d83889d360d63a97f383f3771072aeae551e8008447861898c6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://alburigiott.it/userfiles/files/50356086221.pdf In PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e81c9f198dbd59aaff3d3d4322a34833/kiduwukarajorewujago.pdfIn PDF document text
    • http://intersonik.eu/upload/files/76945283038.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/98861209666.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609414b224a26---95698915118.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/7ecu1in6a3d7utsls4imflnef4/99729127452.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/vikeraxur.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/8797551154.pdfIn PDF document text
    • https://gilbertems.com/videos/file/nasilegedizogizagaj.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093da4cb513b---nosasotuxo.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607da9802ac56---94874237664.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/kefetolopitez.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/84394915962.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963748d02ff---pobetelajipedepiv.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606db9eacc1ea---51899679428.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/nafenox.pdfIn PDF document text
    • https://davnosti.ru/upload/74740208303.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/83563118190.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/48211610281.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32fe3c939c---bimawakirigifigezazi.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/mivugejafali.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/83021260151.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/98444399104.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/32037521655.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/sudatufitofupu.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/45434616373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=%D8%AA%D8%AD%D9%85%D9%8A%D9%84+%D9%83%D8%AA%D8%A8+%D8%B7%D8%A8%D9%8A%D8%A9+pdf+%D8%A8%D8%A7%D9%84%D8%B9%D8%B1%D8%A8%D9%8A%D8%A9PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB958 18532 bytes
SHA-256: 6a7f00da1675293ca3ce39c0dc7c1dd86e4dfce6f6a324db3c1da323d45cb44f
font_01_sfnt_off0000d724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD724 18356 bytes
SHA-256: fab30fc3205ef19e302c82b30451d520887a486374a2990dc7a10108e55423e3
font_02_sfnt_off0001051e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 9372 bytes
SHA-256: ab692011bb810b4091e5b6863c1468cc19624005727076e0e42723678ec61724
font_03_sfnt_off000118fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FC 18440 bytes
SHA-256: a68dde5ce83e65a9f09b421b314e9c8df49135d9013d2f170f48e76127fe6372

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