Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4f5e2480ec3e3e…

MALICIOUS

PDF

76.6 KB Created: 2021-09-04 06:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d6cb1b665b6cde9c9ac3e871b59900f1 SHA-1: eba976761656974a176c81deb7bc3662ac83fa4a SHA-256: 9e4f5e2480ec3e3ec2ae8eb08631cbb6f05df6323a34c2eb4b51d83548882468
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various websites, some of which are hosted on compromised WordPress upload directories. The presence of these links suggests the document is designed to lure users to potentially malicious sites for phishing or further exploitation, aligning with the Spearphishing Attachment technique. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://easy2ticket.com/upload/files/zojonojuruberoneleduk.pdf In PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/67s8jfp953vc11lhg28nns2mkf/lunamosotowu.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/33edcl2ek5vchk8sba4ukvc651/72468372310.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/wosevibekapubukugenuf.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b61757c95---tinelasavon.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/43059366821.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/68376671534.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/4807c02740381d03f89bf54fa81d0296/gevulej.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91fc397aa---tugazor.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/vijokaxegejutosajofawi.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9a539298e---vefasorukowotop.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/zosixenigopokakozoruwasus.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609442c4030a1---1635437502.pdfIn PDF document text
    • http://abc-tel.ru/data/File/pabenogemowedumaj.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/walexikovo.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/55528240823.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f0ce3ee86---79928347872.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/36882159529.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/piwajed.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/62977515007.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/jolaposegofetafoxerumasa.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/2b9he0imh755d1e3qdh5arj8h7/talipakefe.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160928e91d8bd1---nimixogisuwagogimilil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=perkecambahan+kacang+tanah+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA73 10872 bytes
SHA-256: d1336da93405a10f293ccb5867108d78cad0541b8ac27fe7d7a644028b852d47
font_01_sfnt_off0000e2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 16200 bytes
SHA-256: 585a53be0a84b354191f5736f5e14700420a51349928b2d71346adbc9bd963de
font_02_sfnt_off00010c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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