Malicious PDF — malware analysis report

Static analysis result for SHA-256 617f467437ec341f…

MALICIOUS

PDF

73.2 KB Created: 2021-09-19 02:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e732757408d344c46a2b20aee66bafd5 SHA-1: a049c27de3d377f9904f84429a3e219243144b2a SHA-256: 617f467437ec341f1123460d132cb3fce778a19bc817d960066faec33bdda7c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aiming to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=difference+between+iphone+ram+and+android+ram PDF link annotation
    • https://propiedades.net/ckfinder/userfiles/files/nubigofovigokexufujitovi.pdfIn PDF document text
    • https://chv.vn/userfiles/file/zexajuzakijaki.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161370873cc954---febagusibudu.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/18071915314.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/xirovanopegemetiruk.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/51361470218.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210914083456.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/jikipidakoxadun.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/74024658823.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091703450791666.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd28c21812---3630317052.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/xukuk.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146093cde2cd---992323515.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210910033409.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/jejexunanigowitale.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135ab864a76d---rexorugajusawanosi.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/kokuvowo.pdfIn PDF document text
    • http://partnercable.com/files/julorotojugokofala.pdfIn PDF document text
    • http://parentini.it/userfiles/files/tilivezivideta.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/padivizu.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/77899049849.pdfIn PDF document text
    • https://ysh.my/userfiles/file/60444052427.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/jilobikaxado.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/punekuforivatoj.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/50308059253.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_off0000b9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EF 17104 bytes
SHA-256: 4d3ab5df27dc29fd57a24d0a6f793d48553d36ee2da5c116e7f57d852799cc8f
font_01_sfnt_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 10900 bytes
SHA-256: 4bb96eb05744cd3c1319e96e3dd30664d6636adddb34997a2869b5d57d78bb0c

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