Malicious PDF — malware analysis report

Static analysis result for SHA-256 8879bbfd3d87bc23…

MALICIOUS

PDF

91.1 KB Created: 2021-08-16 18:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 491f0616c9dfe4196980d3a8e41d8ae9 SHA-1: 584e66727f7fa183538aae8a023d193deab016d7 SHA-256: 8879bbfd3d87bc231c250d87af8ab1999a703928fe4bef58ae46b0ab57826b2e
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including those on compromised WordPress sites and disposable hosting, suggests a link farm or SEO poisoning tactic to lure users. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the idea that the document is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=wwe+2k15+iso+file+download PDF link annotation
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/83137517154.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0ad8945a5---95856367431.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/lelowupufilipateragid.pdfIn PDF document text
    • https://paulins.se/anvandarbilder/178/files/xafuketeve.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a284e206dd1---80521989001.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/52416450128.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/48edf15ad2e69d82c4dd1061ceee3601/39766651604.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/18146591649.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/57192498542.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/16487562101.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/dbf3f9e316f587cdf35342510c6216ec/ravepevufanudure.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/buzigesitanus.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/7e7039a55e4c1a25b692c388bfb3f86c/91715654323.pdfIn PDF document text
    • http://nessium.net/userfiles/file/84969985349.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210719124252.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/97f3dd365476ec865270c5f5592a09cf/36907206224.pdfIn PDF document text
    • http://mcutech.net/upload/2021/08/file/16281220952038148321.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/3c84130f291b1436350801b2727e79c3/noxevujagiraji.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/22801691975.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161059a983cada---zavufomatedal.pdfIn PDF document text
    • https://avenue102.com/uploads/file/317556779.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ujuabmn4vghto6alag5lqdg7r2/nifixurotim.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000debc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBC 10624 bytes
SHA-256: 5a50f2e2e9e2863b7f413e58148d054f7509a5871f4f05798ca0c1d9516175e7
font_01_sfnt_off0000f751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5E 8192 bytes
SHA-256: c85b5abeaf72f5cfe4f5a97679a3e679615fc9428850c3f0c18fbfb250c72c1d
font_03_sfnt_off00012a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A78 19704 bytes
SHA-256: fab4c053fd7b60e0cbd14756a1ed0d6f2482b9f3ec4bd85ed04b7d6aca8cc46c

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