Malicious PDF — malware analysis report

Static analysis result for SHA-256 824428a4dbdaa81c…

MALICIOUS

PDF

75.3 KB Created: 2021-07-03 08:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3518fc4e66de4596ffd72af2ffd94a7f SHA-1: 19ea5b4ad4a70ee4ee3c5b1594a92af74f5f4eb8 SHA-256: 824428a4dbdaa81cf10e46d2daa569686ec4c28dd88d2615f01879b5bcf774f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to obscure the final destination and potentially leverage SEO tactics. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=fatigue+and+tribological+properties+of+plastics+and+elastomers PDF link annotation
    • http://amirafouad.com/uploaded_files/file/buluredasug.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/zafamisidikotulitilugige.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/6671330961.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/65872583420.pdfIn PDF document text
    • https://sealskinz.ru/files/file/wenuzagaxotuwuseguwegiwov.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079c5478d230---zomokarifodojozu.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cefd7cd0e---zamipepopavititakebu.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/9a0893d459547533bc146e067ad595ef/tesuk.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f60c6d81a---xoruwamita.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/gemugaxonosepifo.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/fda435e6c6a24868ae01537d4d269b54/jamojabisof.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/rotigotesik.pdfIn PDF document text
    • https://digireg.pl/upload/vobagise.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/salorigabulamapota.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f8fa5c1b2---gojorubebifazem.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/lamomuzuvakesafefosen.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/85973674149.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072c672372d7---tunejotepugaguliwag.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf48f3d4db---65837813421.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/643cad67a7f0148b0b8e4e6dc52ba616/49449662985.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adedfa649b4---werukilofilomamezep.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/bcad327a534ca601084992b4ca1764d2/xonikuwer.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/isve201cef8ennp0j84rn6t5e2/25425075288.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_off0000c306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC306 16480 bytes
SHA-256: 45efd848c32ed2143c5ec6fa789fd7baf38a8ab5849ad535e930b11dff087e78
font_01_sfnt_off0000edb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB2 11180 bytes
SHA-256: 4952686f63c48e11f0514059f28012bbad84eb9198bff2fc2613e4de0f09f678
font_02_sfnt_off00010765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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