Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5f917e4cdd95ce…

MALICIOUS

PDF

86.6 KB Created: 2021-08-12 16:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 93fe778b1ca9aa1b54f65cde3e0c048a SHA-1: d37e9acf7eeca1d9a293885262cb578f3da66211 SHA-256: 9f5f917e4cdd95cecc4262bbdc784c4669e6633e9a4669be8ee519cee5213dce
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The heuristic 'SE_SECURITY_BYPASS' suggests the document may also instruct users to disable security software, further increasing the malicious intent. The ClamAV detection confirms this file is malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=how+to+install+miracle+box+thunder+edition PDF link annotation
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/cc32fcec5f5e2c5867f9254914e8e74d/79713579624.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/29587066173.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608508266e7f7---12064559755.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/lesaxolupilutifix.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/kakubufofuzijemewisilup.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/93935095193.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/bifuzili.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/fezer.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/70297121493.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-27/20210627081627134097.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5f5d05d1a---17381980977.pdfIn PDF document text
    • http://119pump.net/d/files/tixitorazupupopasorotuk.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1627193861f3f2c1553e649403426d.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/5499817128.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/76785378225.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/51811376518.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/67560396023.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/wivegugonirawelawasara.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/54938001392.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a63fdfc7b---babuto.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609401239a8ae---98904469724.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/70602109259.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9bbaeabce---94207330608.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babae8d082e---36633623503.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_off0000ec71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC71 11056 bytes
SHA-256: 38b8cfa0ce2794d73617f809a8abb9da18651d62a0e144de3d717fd6d5060cd6
font_01_sfnt_off00010605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10605 17644 bytes
SHA-256: a739a603078482ad67c37c83779499aefee3cd46dfa41ede428de7ea7476dd84
font_02_sfnt_off0001344c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1