Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb2dcbef0360ec00…

MALICIOUS

PDF

113.6 KB Created: 2021-09-09 22:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c2f783dd07671dfd460a2a2f71b93ca1 SHA-1: b1b0875559e8a411e29e800490ccc1298377802e SHA-256: bb2dcbef0360ec00e289700e8f7ef6075672a3fc13197d9c871b140be9322f96
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware delivery scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613741351ed73---30364520521.pdf In PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/27159577754.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/55235789977.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/nolutenaxujilod.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090219575978.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/teroxewo.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613274a7043be---16541353919.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/nesep.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131f19897210---xewipefisezaselifepezowil.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/rabafinesikomirebogulup.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/64744311019.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed505af15f---muzovas.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/2s207ljl2nu7s88icrmhsknh60/33374906776.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/81281100542.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138441eecac4---57644410250.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/50862919358.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/30867873084.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/8913022837.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16138e86ea4c5d---metoxef.pdfIn PDF document text
    • http://soc-in.com/data/media/files/dekonupovofegipigow.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/putiduzip.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/wukarigigaje.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317e83458b8---9565025311.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/xofijuxam.pdfIn PDF document text
    • https://apra.pl/files/file/davopikigozorumal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=aur+pyaar+ho+gaya+full+movie+watch+online+123moviesPDF 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_off0001468e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1468E 22624 bytes
SHA-256: 33c1682e8749ca350ba50053cf3de19c9e583ebf45eb2291af76dbaa70f4c443
font_01_sfnt_off0001825a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1825A 11616 bytes
SHA-256: e4742706ff60a748d781de063083b4cbf43a798fbdd3c5b8754f5b66a9495a04
font_02_sfnt_off00019e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1