Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e5e457a099a388…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 08:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 433e0f3c2ff618480a847f0102e2f8c2 SHA-1: bded0196ba45529debac09fb5211673b8bba0f03 SHA-256: 52e5e457a099a388c077aca507e299f4c815f1d9d46e57b70ac648a40a4b876d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm intended to lure users to external sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of PDF exploitation often involves embedded JavaScript for redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://irlanc.ru/uplcv?utm_term=best+app+call+blocker PDF link annotation
    • https://alident.centralcms.cloud/galeria/files/8251559443.pdfIn PDF document text
    • http://school15-tyumen.ru/f/tuwelifokamenexuturu.pdfIn PDF document text
    • http://masihpt2.com/contents/files/21557355228.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9e389ac1f---69913726056.pdfIn PDF document text
    • http://totoumi.jp/upload/file/45248100066.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/gizakixoji.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/lh4302reghia3i22h6drf1jhc1/50715817241.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/jefojopowe.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/mugegorawujaxidilupije.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/mimewavikikule.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/23210225718.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/39570200967.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/77858887366.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/2962488018.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/71527621619.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/30126689644.pdfIn PDF document text
    • http://scsytech.com/upload/files/44360923521.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/denup.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd5e841d81---taravene.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/gedunomeragagirufafuja.pdfIn PDF document text
    • http://nova-auto.com/upload/ruvikovozolu.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/421162799dc9171be306764a91797009/dudesadosevenomesasinojib.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/bepatuxikomodeze.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_off0000d884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD884 16804 bytes
SHA-256: c4adacd278ee609c028c05ff03669cfafc874a969ea02ae0ced3d6cfbbdc4415
font_01_sfnt_off00010453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10453 10456 bytes
SHA-256: 6a60c7b54eb95256b68b26c27c5c4771a2ce6e622602430baad476ae9eaa0a8c
font_02_sfnt_off00011c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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