Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd4f52d9918ed29…

MALICIOUS

PDF

114.8 KB Created: 2021-06-27 23:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3b703bc8e2eff1f7b7dcab9389298777 SHA-1: 279f42d93e6d0d3690bdc4e9dfbb2b49452edf6a SHA-256: 6bd4f52d9918ed2998e55b467b1777d7e1090de2a09cbcfab731202c015e7b8b
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, specifically identified as a phishing trojan.

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 http://allnatureint.com/userfiles/file/pusogokuzarosi.pdf In PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160742a2e28cb6---59709524027.pdfIn PDF document text
    • http://iwnta.com/userfiles/file/zibokesemusuxi.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/wafifuzijubajafej.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0c209bfd0---refugabisob.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f955d46c48---47685325165.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae83a60ed8---livubagorunexuvomupowogeg.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/7c28c14506061dd0e689aacfa30a07a7/tateg.pdfIn PDF document text
    • https://castel.ro/userfiles/file/saxilojatumosabigepezudi.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/pigomugepegubeto.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/gakidixupevuwejibefe.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4b460d055---xawanizedefuwutikegazolen.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16096c2a757d44---noragebovad.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ae0qg0on7s2g90n4n71ap8b8an/damifuxedisulimeno.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/60738964593.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/34861643823.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/76213009371.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079c3d639d2b---zabavutidagedewaka.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766e2e8fe71---37141719923.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/dedaxasosemegusemuzaxesu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b62c118f89c---38396293157.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/12740466725.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2892dabc32---juwumudunosejupogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=quadratic+function+in+real+lifePDF 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_off0001619c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1619C 17068 bytes
SHA-256: 68ba7907172c601319d03dd9a4d4eacdfd9678e234dab5c53bb425daa14fd272
font_01_sfnt_off00018e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A624 10460 bytes
SHA-256: 32197433e87a71f7cc825c29198f684304db515139ba18586b4b88f4fb5188fc

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