Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4be25a5e15896ea…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 09:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fa19b3e09052f9d71c53ffa980d5878e SHA-1: 899449085c663cfa25645bc0735c9dd6d1915631 SHA-256: e4be25a5e15896ea2c683bc67fc0a68b9ac731c3aae84ed8d6cb806d63ad82ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wastran.ru/uplcv?utm_term=minecraft+screen+recorder+apk PDF link annotation
    • https://dammesliepas.lv/ckfinder/userfiles/files/96665884964.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8d1418cf9---petiwovapemanukusasaxogag.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/komafetagapimewofak.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161378b105adae---97131156395.pdfIn PDF document text
    • http://195exim.com/datas/files/zikigufotiwulon.pdfIn PDF document text
    • http://dentherapia.hu/files/file/74394558874.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///kukivixijikaxa.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/770001903.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/telimerewarevol.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/1c9f0e54433cebab47681b7efc913bac/vanukif.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/63996768579.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343e9d10279---kudegesigiximujemiselise.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/53228507838.pdfIn PDF document text
    • http://venkateshservices.com/uploads/53510649338.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/16913512294.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/lanefapemavovijovura.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/82924970859.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-1/20210901134905550441.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161355b3edc74b---bopemalegenemunojad.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7c27efbb7---fixizileme.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/kewumivejitem.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/53902676112.pdfIn PDF document text
    • http://savemaxint.com/files/file/gerelowesa.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/nazimabedazelubogutit.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_off0000da9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9E 10652 bytes
SHA-256: dda2588db5bce98c4317ad5686eea8f49a9024f9f2fe135b7e8dc6f77339ac2c
font_01_sfnt_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 18652 bytes
SHA-256: 5900d6741cbd4d6d3043004a3b73683f9a9da023a181b99b5e8b28db59221b18
font_02_sfnt_off000123f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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