Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b26f9ad895fe613…

MALICIOUS

PDF

89.3 KB Created: 2021-07-24 03:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a857f48d7a779ef0ce73b54d81509963 SHA-1: 66dd9cf543128da901215d06a59d9e3e794bc80b SHA-256: 3b26f9ad895fe613abed99e37f1dc5bade691db16c4102c3e5be715e5d4cb6d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/1ff60544bd204768dd881fffa0178639/xedotegane.pdf In PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/6b3e5eb7199614a6cc4e944a19a96582/28033046960.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/54r3u8eua6ivfm16sv6taa2p3k/27003854630.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/bhbnj3p4k49revr9p426f8mkvn/tuxisakofula.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160854c3c044c3---jomisotodidatuxevupira.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1626957093sefimezoderotibuwubebunos.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/mironeziwesokit.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/xetik.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083ba5469411---fekolozewofekiperaxexineb.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ff82163c7---99529653316.pdfIn PDF document text
    • http://yilip.net/userData/board/file/92414360852.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090934333669---99971218042.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160e675f968702---90904473889.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2c09d85a7---vuxegodexapajuj.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aac96e2b4bb---59491858440.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/96338126886.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/fupogitalavedupufe.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/13909997220.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160916cc563fbb---9403582875.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160756d12035ab---dufiwusisogokotekilewexad.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/rezisakegop.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/b7b8817dcfb4c078e6e6cf96d38b0a83/piwirufekaxufeneteti.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160722ecca36e5---87394550688.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/jomekudaweloto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=watch+mamma+mia+online+free+dailymotionPDF 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_off0000f750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 17992 bytes
SHA-256: 3365d39e49422864ad6c9d5845defbb8d67640299dd510fea3411ced3a02dfce
font_01_sfnt_off000125ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EA 10680 bytes
SHA-256: 42e1b7b719949ed37deb2373c3fd990d3633f52850c73aca9a697ccb3992c5c9
font_02_sfnt_off00013e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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