Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f09c9d3536c81e…

MALICIOUS

PDF

138.9 KB Created: 2021-07-05 05:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 016ae4e93f3b53deeba95018b2bc9f37 SHA-1: 2857ee9cbc1801205740668da038aa2c430cce84 SHA-256: a4f09c9d3536c81e10cf46f4c9919d57f3bf4d0ac2459257c6bf5685f999029b
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The presence of multiple external URIs and link farm heuristics indicates a clear intent to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9856

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://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/5f6t916u90gfcrru35oqgtp69b/lovutaxino.pdf In PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/f94293bf82b369fe83a84791521f8d78/jojimadamadosagesow.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/95682647237.pdfIn PDF document text
    • http://voijin.com/userfiles/files/rofudizerov.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021062413444580554.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607652bf52434---8519541716.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bf36160ba6f---takakamewanap.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/xewapokibugonuvub.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6ce6281e0---xutisewanozomusa.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106070442469452.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/9p9d3vcsafqkfmmmkkjrqvjchj/21875242641.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b848b00e9e2---50452168417.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16097a348e95ec---69893873809.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/95999518700.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/29968081503.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/29175060255.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/fajen.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d99f81be20---90584407299.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/d22fe1164c72e3572f2af9c140db0863/37000592589.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdcc8b184e---nagizunadejokumuvu.pdfIn PDF document text
    • http://indel.sk/userfiles/file/43246369355.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/0g1jh181g9hnpa0f7sksgldp21/83275866334.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/322b2507e61a14561e175d514f749367/lalagixademawij.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/879630c65d44b68b72adb1c6b1e5720c/womibaxaputunubigowudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=id+code+for+party+girlPDF 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_off0001c221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C221 10588 bytes
SHA-256: a2537bcf843f8780d6f528d27dfb50e12631ae459d011f3541cec068ecd667a2
font_01_sfnt_off0001da38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001f24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F24A 16884 bytes
SHA-256: 9e8671da5027ba74e74a8e9d6bb4b42c7adeace3061a388769d7fe2d6339cfc9

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