Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8c236179cb2347…

MALICIOUS

PDF

85.4 KB Created: 2021-07-21 22:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb900ec8ef44964d9a0631b3c7339cb8 SHA-1: 8cd64bd2aea46cea8faea674193a34a3e4afd2fa SHA-256: 0d8c236179cb2347284b6327362736ee1374c5a7e53a891f00a8c9339dc6d22d
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The primary purpose seems to be redirecting users to these external resources, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://leesman.com/wp-content/plugins/super-forms/uploads/php/files/2c436aa8728f1fd3c3d72a970b9b49a3/valunudoxomuxa.pdf In PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/mebazojopimotena.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160927fad0dc9b---nudovobibotore.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/807529609b05167030463adf98c3e8a3/12373766145.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/a158eba114821d7dc6ea0ec909ec1b9e/pewevujere.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd59ca8b04---lazakabakobizaxax.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c08b2d7e5d---22925427884.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a00527494a---fijabiroviluperugese.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/bunipap.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/r0v60q2h36bcc78ogti3iirg53/9777835056.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/1c9r6ms0gj74brlekj1vh72231/kukuvitimurixapitaroko.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf516bc61d3---55507718387.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c707b3fed6---vezudadu.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a752d8d8f06---vipovorekeromali.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5763811cf---34524894637.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/32003074588.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088723c84cca---83709293642.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2ce4a6a86---zejunifogipotomuwu.pdfIn PDF document text
    • https://amblamy.ee/upload/file/nezasozugilobexewolit.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/094d7a2580f660cc4a1230a9a9704daf/91289923351.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/0b1092cdba0cda1872dbd913f2d1cc69/bizukijotokewas.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2078cd8a2f---9874563853.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/vexurubuvupogivug.pdfIn PDF document text
    • https://ijpdua.com/contents//files/48867603684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ohio+state+university+woosterPDF 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_off0000ec7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001048c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048C 16496 bytes
SHA-256: 55f7b08582b0d0afbf24727e5bf4bfa7d30452c1923624c66e4edc02821eb509
font_02_sfnt_off00012f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F41 10552 bytes
SHA-256: 1f8af2af0a0839af50e71bab141ed6291b90f7cfa883595abb535f2c2710d1e0

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