Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4603e1d9feb57e…

MALICIOUS

PDF

89.0 KB Created: 2021-09-04 13:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f0ccbdfec2f6ff5004b20d0798bd3d0 SHA-1: f2309d8ddbb8297353a7a0796c0189f7146a6e5b SHA-256: bb4603e1d9feb57eec5c3644266977c2f009226b225b65073a3b3f1b8e763245
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.jokilaaksonratsastajat.fi/file/ginijajuludawinezegalag.pdf In PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079389075bf8---76090883395.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/23017252048.pdfIn PDF document text
    • http://darstin.com/userfiles/files/20577915218.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rasaxinivox.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/81423623110.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/mubagetaxovagurisowivuvib.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607374eed6c80---zamonofalukotu.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/85055298985.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/nomarelesiz.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/96725412489.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/47732026881.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/31257380414.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/gatafasefofuludofo.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/81bbfde83b92edd4fe308eb4b4bdf6b3/wupanelo.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/0c8cea95af067bdd2f2e0e3cc8977722/nakawapipakuwulikusom.pdfIn PDF document text
    • http://technocom.pl/editor/file/19783530703.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/424d3b8ea558e58e57d1aa62026f1e24/dofepovavovi.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/vt1df0sh23slv6mcqbs43kiiab/jidijemotila.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e28051111c6---dekupureridopodivo.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/8rp8dq75r3rfu4plq2b8hb0lhj/xonenum.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/nojudenum.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/51937600977.pdfIn PDF document text
    • http://vhshf.de/File/60962181793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=letter+writing+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://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_off0000fa14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001122b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122B 10220 bytes
SHA-256: c5226521d19a9e5df82d39e826baf6cecbfcc4b0e4ec3e498411842f5b7e6450
font_02_sfnt_off000128ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FF 19164 bytes
SHA-256: 1dbe9b8080867c44afed0a046fbdef8769320c1a3dec9c5e948c969bf4b767a9

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