Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b6ccc0d6b53511…

MALICIOUS

PDF

78.1 KB Created: 2021-06-15 10:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4b0f95ad206dabf9685ce2bd21dacbce SHA-1: 6deeb4f96144c7fc267633d14d91bfa22eaf1073 SHA-256: 49b6ccc0d6b535117d04fd808bdcb01644b97ae07e55d12c270ddf32ff87c19a
156 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to redirect users to potentially malicious content, disguised as a quiz. The presence of multiple URLs pointing to compromised WordPress sites and the ML classifier's high confidence score indicate a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to exploit vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://coretry.ru/uplcv?utm_term=basic+electronics+quiz+questions+with+answers+pdf PDF link annotation
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a0475ae21---15522424370.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cc7a4fea7---benemorusurovawavema.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/pobevinolagapuxexe.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/29188257567.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/mau0hkenidka9ua6lfp8p8jop6/sudakitokidemawugurudos.pdfIn PDF document text
    • http://poorclarescork.ie/images/mowaropanojafimavo.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/lekofibetid.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/ad9cd28475c0fbc411b4ea9caec20248/73651778177.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a607fc454f4---batutupuw.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160970300d39d5---48210069887.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/fexuzowokidironuk.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/56620830a4da659070720ba890617442/rudekexizupu.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/wataruvakazexewokeje.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/lejidenujudipurowi.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/50027594f119750f910cfec8ad862500/9349062523.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_off0000ef7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 5560 bytes
SHA-256: 485bd0937c9899fdd65fe0b81ccb082c5ac584a48eccf2a65ea6c3839b112ce4
font_01_sfnt_off00010285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10285 11476 bytes
SHA-256: cf309d2d3bf8e780648e8d1812d90ad0ba9cae6dc50bd0d13553fcf69ae97950

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