Malicious PDF — malware analysis report

Static analysis result for SHA-256 76cadedcf7481623…

MALICIOUS

PDF

91.0 KB Created: 2021-09-23 09:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dc655b9072017390dcf0e7b38270b2af SHA-1: 4fd78702180e01774c6f92f721b8a7579f0bfb0f SHA-256: 76cadedcf7481623d14a69f8aa800957c303e606b65c04e533cefc6c9dc95624
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely involving the redirection of users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/uplcv?utm_term=cual+es+la+mejor+aplicacion+para+descargar+musica+en+android PDF link annotation
    • https://firesystem.ro/imagini_ws/68239300411.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/muvuxeleb.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/2dbfb1cab28f9b1e1fc5a07c6a39208e/mefifuloxopogina.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143eb3920794---ginuj.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/21528810119.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/81463038918.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/52638912899.pdfIn PDF document text
    • https://protrialse.eu/files/files/68036189217.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/ec6690a32c9b429ed3d0d3df8aa6bbd1/598051929.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161338d4374d09---wuziluzuduwizodum.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16143d5482de53---deperomofinowofufegubi.pdfIn PDF document text
    • http://luyutea.net/v15/Upload/file/20219238104450.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/2ebba0cb8ee1e443ce1953577820fb2c/nijotigilorezurepagenot.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/9382325231.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/kagotuwud.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/42607388469.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/fariwamedisolomizolid.pdfIn PDF document text
    • http://boki.hu/editor_up/74633592110.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/56471942992.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/vivolomulubipazopevu.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/36343988684.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/59058034796.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/29129492133.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141752674024---dafifulasu.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/12903295426.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/nejofozu.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_off0000f752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F64 19780 bytes
SHA-256: 73b7e90cd533a00c1ffa82b26d63211f245821b63b9c2542007194e92e620336
font_02_sfnt_off00014289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14289 11020 bytes
SHA-256: 4399b25c1409e5137e4b0c71473decbb4a22512da444530876e51ec83263e30a