Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8fdd5f33a2ef7a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-19 01:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 26b56b0d720147a171f59c742193de5d SHA-1: d691917d0ff34f0651e104038108c25a80cc2f6a SHA-256: 6c8fdd5f33a2ef7af77debf068b61cd46ab999a7280b69bf72d1d95958768203
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The presence of a link farm and compromised CMS uploads suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ptichile.cl/userfiles/file/1921985783.pdf In PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/zanezeparumi.pdfIn PDF document text
    • http://tlca.com/Content/uploads/files/93649089743.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/87684117373.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/tamexosoxi.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/zededaxuluzafudujop.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c7fbc00f1---fovatenulezewakixiva.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/tezudovemek.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/0f45771c5d9e00b0ec2c8cf9026bf19e/35768178064.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/40948282989.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/65612480499.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/82018853724.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/labakem.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/bitiraler.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/54a0a5c72a2e58c21c4d42a86053e01e/27271749203.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/depato.pdfIn PDF document text
    • http://ruresept.ru/files/file/rukat.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/mugibifirogo.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/ledufizo.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414c683e459---771773294.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/vulebuwumixeb.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/71038834682.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/90614696608.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/92905239165.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342478141aa---60065223103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=vsdc+download+pcPDF 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_off0000e510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD27 10140 bytes
SHA-256: 4ad762db5d2c54da0323514929768fee5cdee89123f53faf18612c833dd65c82
font_02_sfnt_off000113fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FB 17964 bytes
SHA-256: 5ad863b1fe9985c204b24cee73617b7710d95afc37788a7651455ea8c1986ebb

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