Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c32eb6a79e22566…

MALICIOUS

PDF

72.4 KB Created: 2021-09-25 14:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 68c188553937ab09d9d0d381f3f3ed65 SHA-1: 7616eb19d675606a0a3b0cf970b26e97c783b4db SHA-256: 4c32eb6a79e2256699ebedde072bdfa37dea4449b478f33929f5f6576d9ec06c
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://cructi.ru/uplcv?utm_term=dirty+dancing+2017+full+movie+free PDF link annotation
    • http://e-district.org/userfiles/file/borodare.pdfIn PDF document text
    • http://wjcopy.com/upload/files/7817407933.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16136f6852a771---88525837499.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/kofunulipagedade.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c626450067---42167729711.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a39ea4308f---78087133838.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/73223238176.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143326130f9c---tinaparakurojagagidat.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/81907471161.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/xijowitezowatasuzup.pdfIn PDF document text
    • http://afinamebel.ukrkarta.ua/fckeditor/userfiles/file/vejurumerefupapomupagoxij.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614223f2c5fef---29637445387.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/pexilizevexabejusafere.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/75346976457.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/45115908524.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/voxojo.pdfIn PDF document text
    • http://cutskytools.com/d/files/vativirafinet.pdfIn PDF document text
    • http://specialcats.nl/media/files/tefatuzu.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021092402000373499.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/tavuzejofajux.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/lanamedusutejijodi.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/59204900136.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/43549152658.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/kulesipi.pdfIn PDF document text
    • http://sjhtractor.com/d/files/60636952892.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/jebiguzalo.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_off0000b624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB624 11276 bytes
SHA-256: 27052289e0c6b78f5b8fcf16b148818cfa0264594ba632bee18222e4408eaa7a
font_01_sfnt_off0000d095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD095 16936 bytes
SHA-256: 7620e580b739602d31919935540211174ed9f5d035599257067aafba1266f131
font_02_sfnt_off0000fb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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