Malicious PDF — malware analysis report

Static analysis result for SHA-256 3536f746ba377926…

MALICIOUS

PDF

116.5 KB Created: 2021-08-04 01:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c96cee38975b65a088dafae271f0d983 SHA-1: cccb05501c5c57f3562f72f48e00ffe8bda4a9af SHA-256: 3536f746ba377926203bb14089b1b3afc80f5fae0d878a487f23a477859e29f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://zivotzaokny.eu/res/file/tilusizetawozes.pdf In PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/253e879a32b17eadfa5270d06660db6b/47274809232.pdfIn PDF document text
    • http://berbun.com/user_img/file/peselerezew.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/37101961481.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/lakosarizu.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/85361025310.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/riwes.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/gozejikit.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085bec976419---vebirodukowomukuwe.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/95538128156.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/mibazo.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b3e9036d58a065852504cb3c41a94eae/nisutabibolifesasavuton.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/17c9b1a42282832e97a73c6c5e85e013/55032390395.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/06474fd44e7c3b692716b1c6787f7e56/juridunaxero.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0fe1d339e---titigafuveluzaladew.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/89f5affcbe37c1b21ef121a0eb21b0ad/71286821653.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/vurova.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/59917978058.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/911752aa404fc314b89a160f805dd252/44791505557.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/mifoxeso.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16082777556dd7---xagoxinosew.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/56023895318.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/a9c2c02fdcc1441e38a270cdb12b3323/8615940128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=kanye+west+hallelujah+mp3+downloadPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001473d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1473D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F54 11056 bytes
SHA-256: 7e1e09b3bdf3b566e9735ebbcbe9aa1402aea93348c5c7f635c2ccb4efbf1901
font_02_sfnt_off000178fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178FC 20220 bytes
SHA-256: 11d39e06bf1cdd6f98758843ad772f1d30a58c5f3e501473efb92a85c1d67982
font_03_sfnt_off0001acb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACB2 16576 bytes
SHA-256: 4ff9829e462969f7f6e70e2c471baa7150852562d8e809f02cf473a736f3d210

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