Malicious PDF — malware analysis report

Static analysis result for SHA-256 86673f6ee6a808ae…

MALICIOUS

PDF

76.1 KB Created: 2021-09-08 00:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e48d8af4fbbeb348489061114ab755b SHA-1: ce7d019771ed424b5257cbcba0b982b085af94c1 SHA-256: 86673f6ee6a808ae6fdd6bc95c31a8606b11049b47e40c848e343f7c307fc102
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to potentially compromised websites and disposable hosting, characteristic of a link farm used for SEO manipulation or phishing. The presence of external URIs and link farm indicators suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://luckdidea.com/ckfinder/images_store/files/jebeduredukevesok.pdf In PDF document text
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/gifamuwekor.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/64914264468.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/hn1qu5e4nj4mli399g3ua6fbqu/rubojasog.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/sikinupewinudanosoxavuti.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/77178134206.pdfIn PDF document text
    • https://rcot.org/userfiles/file/53996204291.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62429151d---54203159969.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607231eca2ee8---juxozajivevo.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/mozekazej.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/81922683405.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160cc57edf2d42---weguzub.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fe34ef75c---9070105793.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/09a3538a839a805b6fe189e1ed99d733/8781548066.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/18935234306.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/fabupeg.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/rqeg0uvgtrq4143rmn3ndkroc5/senukamo.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/sutelidiwimo.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160be1cfbf1b42---fopavux.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/peguzopatumutatima.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/40694147878.pdfIn PDF document text
    • http://d4sontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/lujagunosolepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=writing+prompts+for+second+grade+worksheetsPDF 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_off0000c66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66A 16496 bytes
SHA-256: 56895d151250f9cd0184735bea7346fa37ba244dcab9e024476dbc3e06545789
font_01_sfnt_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 11192 bytes
SHA-256: 64de520ba19029d29da590338cab6ba3c37a2dec8323500ee151e4408afc6a32
font_02_sfnt_off00010a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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