Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad3c69db576dda0…

MALICIOUS

PDF

84.5 KB Created: 2021-07-08 08:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e1eabfc241548764ef5800c83f6545ca SHA-1: 9e8532c3206d1b445561eaa20f6a41c6f27a51ff SHA-256: 7ad3c69db576dda0155a2b6132b9fa38c71f2ee47b62b0d6b8189deca5cff3b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=science+class+6+chapter+8+question+answer PDF link annotation
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/46314a3caf189c939853a0dbb126c0e6/79577183566.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/664perdie508nsqcvd5dpeieu6/zulewuvasobut.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/cc51007e132a3b19b25c1bec9b88a2ab/94152381898.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/19728999770.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/48374d99j9mffbk8u1f08rspe3/72976290963.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/57318661887.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/23100627836.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608443a826c42---7044351834.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/detotalugilirosejezu.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/getubu.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a254d52777f---77209314796.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/ae60666fe2442fe9715e89b8fa94e0da/mibukejav.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/jnfg9asum96csvbjvoharhla13/fomowabibaxixevulugebasij.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/vuzubevimadofuboze.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/vfttmsjhbcd9a39jdrdiadveqr/tirijini.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/42838523152.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1dcb108bd---51928644840.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/4e6102a952774ee3c5c634b6587e047e/61166852349.pdfIn PDF document text
    • http://bakoca.hu/files/file/65729642163.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/2020468118.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/16839237163.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/67255187133.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1c70ea089be652208a907d5e0678ce02/zuderuwujumukoreta.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_off0000e4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C3 16812 bytes
SHA-256: a1bdbfcce4576bf98c953ed9d3d324fba5a82d712b8b9dfa7930979a280420c6
font_01_sfnt_off00011040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11040 11256 bytes
SHA-256: 4c98cf7c598ac2cb4ad777b6dc7729974c54b0ab31df83d0d379e2a7b7a05575
font_02_sfnt_off00012aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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