Malicious PDF — malware analysis report

Static analysis result for SHA-256 9641c88f5e3e9f08…

MALICIOUS

PDF

75.8 KB Created: 2021-09-18 02:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 157fc0f448dd24c6f4a16f33b26dd2b4 SHA-1: a4c67e0699aadfa4a2e28868f5214bf363f078d2 SHA-256: 9641c88f5e3e9f08505cee5b2eba83c75e5c0b052ea16f5691c6eccdf2ef6111
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF 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 embedded URLs pointing to compromised WordPress uploads and other disposable hosting sites, suggesting an attempt to redirect users to phishing or malware-hosting pages. The presence of external URIs and link farms strongly supports a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://giant-nano.com/app/webroot/userfiles/files/sebopelejapisom.pdf In PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/3102442470.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/34041810022.pdfIn PDF document text
    • http://hmed.vn/upload/files/14218343936.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/gaxerononifa.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5o1uthc7tedrj853krjbcetlin/rivuvamuzozuzijarabu.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/97479585710.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/939c2696b9eb3c696c55b093d7a822a7/febebefapulafuwapo.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/ga51h706d3l73s9e5ounpco2l1/poburopafumazuzelume.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130f2468c1bf---vuvaridosevukokodufilub.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/butidigidupi.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/vekasifopogiko.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a223f5bb5f---zuxevadawirononani.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/30173263944.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3088abfa10c36df3a643c0fe82cd96b6/2206255363.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/15735030901.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/96923259730.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/51053675270.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/da52ab085195fe3e3a283f96a6b44182/51661109977.pdfIn PDF document text
    • http://ipllaser.in/uploads/mupemubelezun.pdfIn PDF document text
    • https://12shio1.com/contents/files/76333071589.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/85548987083.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/41965608790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+put+pictures+side+by+side+on+androidPDF 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_off0000c2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E7 10892 bytes
SHA-256: 875268aa0551581471a2ec4f0439645d970f64bd98a2e461e624b918d7c566d3
font_01_sfnt_off0000dc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 17576 bytes
SHA-256: 47365716a32d9fdedadaed761718ae19675d9195bb7a015f15b2b2cc4158630f

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