Malicious PDF — malware analysis report

Static analysis result for SHA-256 018287b4c70472c6…

MALICIOUS

PDF

101.5 KB Created: 2021-09-07 15:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 35b651df79ea32e43f5cdbf6ff82040b SHA-1: 4af9f21cf4f47239b2b0440bd2a45b053b658e88 SHA-256: 018287b4c70472c64fc491c33ba4adf527d0f9accc291eca127b94d7da188e7e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly indicate malicious intent. The presence of multiple external URIs and link farms points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pixomot.ru/uplcv?utm_term=le+droit+administratif+general+pdf PDF link annotation
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/53046e3d70719740c1f3ed72cbe4bb7d/rameraso.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/vebuvam.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/toxelomawiweziranu.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609a67e42442c---kavanajazazedide.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608707cd2c61f---52031304694.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b15d1229065---rofirulopu.pdfIn PDF document text
    • https://razredna-nastava.net/files/81096888395.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/793543296.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/11648080956.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/javipimob.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/g9t10srs3rkg1rio5tv6p9vjp4/3243359070.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lerepex.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/11a6d59c7b9819c6911703616f25c698/35741629071.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/4799732538.pdfIn PDF document text
    • https://onlinendttraining.net/files/43318360874.pdfIn PDF document text
    • http://gibisch.org/files/files/19961510475.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070a7b3b878b---87034088699.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/7670901183.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/katonix.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eda7c107f---53011447008.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/83429108a78d89027536f87b598b7b6a/dakumanusalupivanifigakab.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_off00010d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D51 17976 bytes
SHA-256: 8b6acea1d3513531a7be90ac1e7ddd4247e20d6a70026effdb7e22b0eec32e09
font_01_sfnt_off00013a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A39 20880 bytes
SHA-256: 0d354173d647c035fa44777a01c19cad342db3edf7308ddfb903cb7658bc6aa6
font_02_sfnt_off00016f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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