Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66a2a8022048de0…

MALICIOUS

PDF

85.2 KB Created: 2021-09-21 04:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a150ede09d9609cbd41ebc154c591d48 SHA-1: b791a446cd120edaa227a58382cd4170d494ac10 SHA-256: c66a2a8022048de0874478e3616c33a9af8400188acbc6c3e5c50aea478bc49f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript, though not directly analyzed for specific actions, further supports the malicious intent of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=code+robux+promo PDF link annotation
    • https://perfecthospital.org/ckfinder/userfiles/files/kumemimexedudez.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/67847427167.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/ca7a5994fbc1151f0f37ae2b5e6268e3/43079829790.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/zamin.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/50cf471254808156d3c6fd396c45a2bf/wugokexafeb.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/wamemitodun.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144c81a84e12---voxajat.pdfIn PDF document text
    • http://talleresjpg.es/img/file/82284051581.pdfIn PDF document text
    • http://thongthien.vn/upload/files/simaminugojimiwe.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/87542409813.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/sinikofipil.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/powaseguvajen.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/xanazepelatigaj.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/ritos.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/31911340324.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/45427723957.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/wilewujovafu.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/29311610585.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137587f50d76---24614624288.pdfIn PDF document text
    • http://fohow77.ru/upload/file/bodufaz.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/57828379921.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/533aee1a7c36ab593415a7084d2735f3/juxobosofe.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/17889531527.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/bpn4g0l7kckq3psc5q2cp5smsp/92639156638.pdfIn PDF document text
    • https://betsin.org/userfiles/files/89380324283.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_off0000e894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE894 18168 bytes
SHA-256: bb22d1a53035822ee9dfd544b9ac5eb5a2b1c23071e1d0e72e303740a32628b9
font_01_sfnt_off0001183d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13054 10256 bytes
SHA-256: 2117adcc30e4e147edd06e5522cabe9f9f767bd8600a031cd505f9c0324ada54

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