Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa7f4fad6a28a53…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 14:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a0567c20af8c81e6dbedda9df3712875 SHA-1: 974c6f7aad46d980ef572029351ff8810237639a SHA-256: faa7f4fad6a28a53d558feaf01f7e2e7cca47de58d284f69692a08d39718c240
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://koovappadyscb.com/ckfinder/userfiles/files/55316619524.pdf In PDF document text
    • http://angeladaniel.eu/uploads/files/8995387749.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160efd9618113d---vapimejipenejebijawuzam.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/41004815344.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/reresiju.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/zolarobodolasadijir.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/1589642230.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f08f2ee85---vadofaginiz.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/24492922485.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/78326389471.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/4861e79cd55fc94c3ddf2ea512efb2cd/fifidinotesafopaluvag.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/vakinetababuwixarepigaw.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/nisepes.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/magorunefatikatabesuxa.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/60634449578.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/xafufiwepodemex.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a02eb1df2---pupebijebewaletovabanupen.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/gogekowamijipakevano.pdfIn PDF document text
    • https://kimansion.com/uploads/file/31037250030.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/d69gnq0t293i6oafhugpomju1d/dotukujesazikivoweveno.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dce5622d4a5---12344975614.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/672fe80fd6bba5af5a2038579f1812ad/81234536279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=heredity+worksheet+grade+6PDF 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_off0000de74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF686 16352 bytes
SHA-256: 80cd6e55b59c3c3364a787fb084c625a12be8dcf65458457423e39653986a250
font_02_sfnt_off000120d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D2 10828 bytes
SHA-256: 1ce80ec532714076ce4414b6cc7b051ae51515331bddd90ffe1431ae004d776b

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