Malicious PDF — malware analysis report

Static analysis result for SHA-256 65021c4f6adfe8ae…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 00:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fb211c13ccd3ea06e42af094ac3c55d5 SHA-1: f3df0a035f48c459d49c49f7e43a8fd2f023f47b SHA-256: 65021c4f6adfe8ae086198b020803dc5783230745fda523f137bebe027015d49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs like https://nomylo.ru/uplcv?utm_term=chemicals+strategy+for+sustainability further supports the attack pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nomylo.ru/uplcv?utm_term=chemicals+strategy+for+sustainability PDF link annotation
    • http://szerecsen.hu/editor_up/56920020416.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/juwerimepogamiwafiwin.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/tikifibumi.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/mowapajof.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb4aea376e---36979364640.pdfIn PDF document text
    • https://birotex.rs/images/files/logokunejesixijovikeg.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/zibera.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/37038267741.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0317a54b6---gobubevoj.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/4c07e529a3a328a409aa1ad440e30614/boguvuta.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074be8ece86f---99353175596.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a335a7acd7b---devixago.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16206268991826.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/sejasetozibo.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/7d78cc5f8223ffc55e49053d5e91a178/bamav.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/dikiwowireloputo.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/dejuwipo.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/6310683677.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/6075727280.pdfIn PDF document text
    • http://aimic.com/userfiles/file/tijabuvetojijewabivizot.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/a9acbe8b965d9269a1f1a9a304ded840/68242561491.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/88142831678.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/45696389669.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_off0000dafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 18236 bytes
SHA-256: aedaa9c6210b3645872ef23e69c321acab0831b4aca9b1b3d57c79e98adad461
font_01_sfnt_off00010a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A74 11168 bytes
SHA-256: e80e1336de0c746c9dd8229de8ba51672364ec62f3d62598f7e4b64ef25307d4
font_02_sfnt_off00012475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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