Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2260886de652bf5…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 02:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75162523a19c4755807f3edd97608425 SHA-1: 3b27ac76c2aabdad712036ed24eb5e60201456f9 SHA-256: b2260886de652bf563e9e3c232c8a8f1792789f60ac8372d5d027c9bdabedd44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and EMBEDDED_URL heuristics further supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=montgomery+funeral+home PDF link annotation
    • http://seoulsquare.com/userfiles/file/60639519868.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f0842fdaf---kabonujibejupux.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/12658877658.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160baa99444493---13530429789.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/vikadurifixugubez.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160744199bfc33---8878165589.pdfIn PDF document text
    • http://landpas.pl/upload/file/65828107028.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/tujabinonanotolaf.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/divikaj.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081099cb9f7e---46989120636.pdfIn PDF document text
    • http://builderall.info/userfiles/file/42993697999.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/gejuko.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/94d92cc1f0963f0b87b891f418492676/vukolubeviroweki.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/zolalugozibipexi.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/7dced80c4cdd48a5593ec90469544020/nenesosefol.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9afc794adf---jepozoketorowojosikaxi.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/10538114083.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/52857090284.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/56294379430.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f74d1a622---milerejelez.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d851bab2d716b047f703934e4655a7b1/lanew.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/feribunaxow.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_off0000d67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67A 10608 bytes
SHA-256: 5d34a54f42ba754a67a828c93e37c0eee0748668e4c1b1048b862466b47a01d4
font_01_sfnt_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AF 18832 bytes
SHA-256: e363bafa6a0d1ae190d2db609ca24a67941ff63c3640126fc00c0b06674bd964

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