Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad2a212d685b2c0…

MALICIOUS

PDF

72.6 KB Created: 2021-09-17 23:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8eaecebfab19c19a0d4d4375fe0ad5ce SHA-1: 5ae9ee8202e3cd15c803935cfee2b6d98251057b SHA-256: fad2a212d685b2c06fc708c539f86e847e7367aa426546f389c45f8f6aa12046
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to leverage SEO and compromised infrastructure for distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nguyenxuanhuong.com/upload/files/lokize.pdf In PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8b4b44ee3---doborixafefasodozub.pdfIn PDF document text
    • https://theurbanthinktank.com/files/33987932267.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/14562939548.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///10083975957.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/87570505755.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/58598826163.pdfIn PDF document text
    • https://www.aillant-sur-tholon.com/ckfinder/userfiles/files/83070275514.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/17225486356.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/39842978423.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/5916721092.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/98800531078.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/zazematukigifenatasa.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/6134651330.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/dd0081fa27de43e3e6cb57479a67d631/76898478335.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/487e7e494a8b191a3b66ebf47b164d8e/buzulijetenaweju.pdfIn PDF document text
    • http://suranareecommand.net/UserFiles/File/90174122533.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/97643093601.pdfIn PDF document text
    • https://ms2oke.com/contents/files/fakekiget.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/juzozadozi.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/63301864335.pdfIn PDF document text
    • http://ore-processing.ru/d/files/29033971995.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/48958237009.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/13218315420.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/83183b54fd336f3289e54ec723270bf5/47902412571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=10+mb+car+racing+game+downloadPDF 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_off0000bb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB23 16188 bytes
SHA-256: 1893466f35e30aa21ecf42fb55d55fbf5889f0f583c835886b811230aa643867
font_01_sfnt_off0000e463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7A 10748 bytes
SHA-256: 15fa458680c496b1649ad164077f5d04a515d2e60041c8e8fdf8a04d90138409

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