Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b105c1e01a897a…

MALICIOUS

PDF

78.8 KB Created: 2021-09-04 13:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: adb4c10efdbe40a6e87b29ef142d98f9 SHA-1: 38963ffe952e461522751c914012c8acf209a151 SHA-256: b9b105c1e01a897a78e11446d6d6cb6851f855924af207445e2fb77d5dd8ab7d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://purmoradiatoriai.lt/images/files/fumijazog.pdf In PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/renexiluberoj.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/26742443739.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/tanotezuberafekolosisitev.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/90638123979.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/bokixukujagizaduvu.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/4eb448c809975292f74dd8be7224f3f4/keput.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/71083242748.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/tajebesumakinisup.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/bikurojemopusizapubeko.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/77832813355.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ba7b25edc---wogaragodixofemawus.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/rodulujap.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160787090efab1---xafajozadepipaged.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a29cd0969fb---22458202271.pdfIn PDF document text
    • https://congchung7.com/upload/file/42323687014.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/davegezizuxanoxomekotujo.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9810cea12b---fubolake.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/19106452994.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf03de19dae---54650774729.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa9b6936f6---radorumudarijituja.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/992205157.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/72846274693.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/24113762444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=genitourinary+tract+pdfPDF link annotation
    • 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_off0000d21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 10652 bytes
SHA-256: ac1373496184db1c878ef30f28a5908687d8c1e79d7060d0d59d4a21bbd7973e
font_02_sfnt_off000102c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C4 16612 bytes
SHA-256: f36414e0f6a9b2345b46550f60b1ffe531bba9a1373b51e0abfc080764fd8dbf

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