Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8946b462aff419d…

MALICIOUS

PDF

77.8 KB Created: 2021-09-12 04:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2f09d66b35519e2e7866f15333e54057 SHA-1: 4675ebaf8051b3a164db4706e5918b5bb4f27471 SHA-256: a8946b462aff419d8986541fb0bb158a1d07421284ee4a8ad74fad96beb7e5de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF's primary function is to act as a lure to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pwmtqatar.net/userfiles/file/basuvubezosobet.pdf In PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/93054568629.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/84034251889.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135a2d2022ec---75097129625.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/55762507048.pdfIn PDF document text
    • https://synersys.fr/contenu/file/pemuzadutoji.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/xoxasafo.pdfIn PDF document text
    • https://okazionche.com/files/tebuwifa.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/tasotilazenurodez.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/44504427744.pdfIn PDF document text
    • https://datajournonepal.org/files/dajirus.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/folizukozowimaziduguk.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/27460725296.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/vezilusezageli.pdfIn PDF document text
    • https://tekartltd.com/upload/files/sivopiwubimojakegadisikaz.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/3ab282d1c1d52c7d6d28316c8da1af14/bakoruzovodepes.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/serejokavaw.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/juduvupomikimuxik.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/kabawedojilif.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/872fc8988ebf25483b643aaa099a4897/resagonefa.pdfIn PDF document text
    • https://ksboutlet.com/file/files/pinexasabedosi.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/39529336326.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/kowiniromapesosado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=memorizing+pharmacology+mnemonics+pdf+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_off0000c827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC827 11220 bytes
SHA-256: fd2692df6923f9dcc4d53d97f2b3e45a1dc2abe4ed10311cc0ba0f198a741462
font_01_sfnt_off0000e217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE217 17768 bytes
SHA-256: 9a9518cb864b09420535d7c4dfb56c0eb079831f440ed3d6419102b46c322ff0
font_02_sfnt_off000110c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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