Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff740b64b3018420…

MALICIOUS

PDF

70.6 KB Created: 2021-07-21 03:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f9b0bf9d3a14e849a3c376e3bced757e SHA-1: 5d801945616ac1f4a22462b6e854577bfd0f29c8 SHA-256: ff740b64b3018420c0e1f50650f7debb88a791abbef5fee0b0879a35e688247a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute malicious files. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to obscure the true destination of the links. Although no scripts were extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7628

Heuristics 5

  • 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
  • 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://amdind.com/userfiles/file/bixatigukarininojibegap.pdf In PDF document text
    • https://palet-school.com/files/files/tulizogimeposotawomutasot.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad867759e9---lodolidaduvo.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/37033138633.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/5489103530.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074213b8a670---tozufotinepepex.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b23c6acf49e---66617504750.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/99257209106.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/95209947783.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/88826502204.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ffs4v1q6mdooeipq9cs9vv9bh3/vunujovuseliniborum.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/tomepilijafo.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/jiwes.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/22181320788.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/42448986347.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd3c395f39---jegabogodovubaratanoxebit.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/6323311011.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/92268791025.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/49detqutpo4qj2tb6bj5vnaqev/guvidijetuw.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a76ebb824f---72486978295.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/jopipojo.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/suxuzewituxit.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/genifuvawujot.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/8558144687.pdfIn PDF document text
    • http://446888.top/userfiles/file/98812288608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=letter+of+instruction+for+willPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10288 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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