Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb69accf5356ea35…

MALICIOUS

PDF

131.5 KB Created: 2021-07-23 03:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9ac0ef79b2d9e9e56d0b7368afc8ee7d SHA-1: 3a981b85ccf631213922020156cc8bcb675cb8a4 SHA-256: fb69accf5356ea353df7bf2cca9589c2a4e9abbcf3b1349b272243b7061aa851
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the presence of multiple suspicious links suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

Heuristics 5

  • 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://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/00482ef8b5cc016969ec7fdbd93319da/75847475139.pdf In PDF document text
    • http://dtpokebar.com/uploads/files/katavajoxew.pdfIn PDF document text
    • http://grimastone.ru/files/magojakuf.pdfIn PDF document text
    • http://novafish.it/userfiles/files/13354374477.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/189c620147071ed98f0ed86143556b0e/kedevolakisipanegezaso.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075774fa5a40---45621866884.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/21553239671.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/47096291453.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/10041270911.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160977deddda76---noted.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/vulevonupopepamebid.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/2283643683.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/jear92rnqaj3auvqs29fgjm82t/rijumodafobolewebuk.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/polesomusezuduw.pdfIn PDF document text
    • https://computerzone.pk/file/58094717407.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd3e426cc8---9048698894.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/budazegonokutirigetanope.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/c3e2705f24bfa8f2e7424a7c5dc7e562/52679098050.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/12072943996.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac117a1e8e2---venorojotawowinujanesar.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cded4e8659a---fojasexosubivajuruvawupir.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/14f4eec4b97cecff1b66fb21ab63acfb/86537966691.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093b454a5620---58421945548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=1+to+10+in+roman+numbersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19432 10540 bytes
SHA-256: 3c73b9d8aac73e5024c69d3c6301cf0421da6548f26ab42a9a1ede9bd8cc3d90
font_02_sfnt_off0001ac30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC30 16636 bytes
SHA-256: 93b23871dd448b78503d8df101173295a7a08e2fcc7a74d3881d5505a730d141
font_03_sfnt_off0001c3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3AC 23180 bytes
SHA-256: 1f30a728c4cafdbf19a9ac8acd78cc09142075a27a4714e6c7fba8707654ae55

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