Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbdae6cdd5dc903…

MALICIOUS

PDF

74.7 KB Created: 2021-06-11 10:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ddc3af27174604009b13e17d49b1cdbd SHA-1: 0249e38908b1d3f5b0806f77182edcc8d3ea8b24 SHA-256: fdbdae6cdd5dc903b26b0653e2ddf0854330195a18096edc44f36560d584d423
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, with the document body and embedded URLs pointing towards a lure for downloading potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=download+hack+last+day+on+earth PDF link annotation
    • http://asiavent.com/UserFiles/file/%5C/65906866633.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/woxejedexizurezagujetam.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16feda2c7---ralegezadikebiba.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/60647231076.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/samisurijukoxuwuxagado.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/setikamasevemeginugixin.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9131ce78f---mupefibamumilafilone.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/33280782793.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/8c4c30c45ee229b1a86646777335dd6a/gosuli.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607150e350992---3980509650.pdfIn PDF document text
    • http://caramelitos.sk/files/kagamozexaxurafuzamev.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/34d129d38047dc69c9cc6f629cd056fa/sejuxapumelibupa.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ab2d9fe61---79027210368.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4d87d1750---gebemox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6C 5284 bytes
SHA-256: baa1743e228d5d5eb6a762c71f2ab0dab803241bdac07853c84792afed886f40
font_01_sfnt_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 22000 bytes
SHA-256: 8e68c1138a175cbea5266155c1010b48c0a949d4eedfea7c4a79851e88456a43

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