Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ef69aa7e4a8893…

MALICIOUS

PDF

87.4 KB Created: 2021-07-03 13:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 69845bad7476a28c288cc2e18e603e9f SHA-1: bf2039a7f55fafc86b91e3b85a42c8fd207d7416 SHA-256: 79ef69aa7e4a8893ce7ee04efe57f61f169c4c4a4c1564b55e6be8fdfedbb2b6
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The primary attack pattern involves luring users to these external sites, which likely host phishing content or serve as downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://oniceh.ru/uplcv?utm_term=cycloserine+mechanism+of+action PDF link annotation
    • http://www.awakohchang.com/image/upload/File/uwedazijuvedinope.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7f96f19a3---zivekuzap.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1be859c5b---48639724589.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc21f7edc0ec16b26ac7bdd394eab669/jotiwexedo.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1d0f0f619---tilotirovetutarux.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/29390269359.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/marajukakadezo.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/96c2f2cedf2cd2679707d2e264feb27a/sapisipabomiwawasewovimar.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c871e37fa0d---wopawowuxodopumite.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/96622059825.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/dapegebolusojarifeb.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/tirakadaruvidirofajal.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/loxajubeso.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/lewinepumi.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dec9da33bb---pujajijaluvunajasupijo.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/25185393701.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/46477017706.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607eabff053b6---60095030159.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/5d57aa5dc7b76460762d352cfae06066/77203923933.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/dbc075435815070fe8ee042c7b7b270b/zetewutakewanefotufixazi.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/lebove.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608389a8e0595---59439728122.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/89801365266.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_off0000f2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A3 10744 bytes
SHA-256: b7901df0e5e5f0542d3135b09020a9b804738a52517b20cd03641c97d7660654
font_01_sfnt_off00010b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B28 17184 bytes
SHA-256: 3ff2c3103f5452ecb3ff6ad2cf644f2cf22808f15247f5fcbd4889e50d3aedf2
font_02_sfnt_off00013815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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