Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71be86651ebaad1…

MALICIOUS

PDF

85.9 KB Created: 2021-07-10 06:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ca1f4a989233f42a0b43ecfc16aa8ea9 SHA-1: 69f2a4c43ab35e8fb508d725e55970b67320c6cf SHA-256: a71be86651ebaad1dbe53b9182363e1c0804da30cd35fe2891bfc146b652211f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: 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 uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous embedded URLs, many hosted on potentially compromised WordPress sites, reinforces this assessment.

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://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9838a639d6---31815800823.pdf In PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/fidubix.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/bc82d72fed344646f52b147a4650134b/daligap.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/60754777241.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9988e55138---83321665721.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/24f2ce24e464467bd9830f61c1a70b41/zifepuxilepodemaxuxasod.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e9f6095f2---jigilepiluzaje.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/b1f0ea2612ce212940d59c3d0a91cdba/bivemetubufajinizasedib.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/7a005cedec7616dc5d9a0af2fe743681/rizakimop.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/97728c74fcbf28b2e7b8d622d59b1b0b/kasozukivubaw.pdfIn PDF document text
    • http://esistore.be/userfiles/file/66246400902.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/37634533780.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/5660440342.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/xatafazozodusigex.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160bb804b06ff2---takevepolajigajelomawivir.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/56ed5b7ad4e9c9bc6b580d43fcf29eee/wedetobopubevibejobidonu.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/d3d460d44af95d9de517f104ae505a3a/31972908162.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202151987213916.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/j3cj4vh0ep7vsm2ss16sr1n46d/2355940007.pdfIn PDF document text
    • http://ahchala.com/img/file/20408384066.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/15132043558.pdfIn PDF document text
    • http://weddingceremoniesbybev.com/clients/72651/File/xidoruwinako.pdfIn PDF document text
    • http://mebco.ru/images/file/49658536988.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/3a8add6f8d21b35dc2b8c4aff46d6150/tavubodiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=gba+zelda+link+to+the+past+romPDF 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_off0000ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 18440 bytes
SHA-256: c5aa836ca2641a27d2694c547f7cb88520fe7d4f1c6001142e48aff229a407d4
font_01_sfnt_off000118e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F8 10988 bytes
SHA-256: 269758c7e99d672a0d28f07ee079492b5ef89e421f3332308432b8dd1be8ac3e

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