Malicious PDF — malware analysis report

Static analysis result for SHA-256 b917559f37a06bf3…

MALICIOUS

PDF

67.8 KB Created: 2021-08-13 18:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6e18ba6ca81879c903431f28c7856774 SHA-1: 3a8f6ee62a449b7e8a291d8e86e2210e113ecf0b SHA-256: b917559f37a06bf36fc3dd4d544365519f94b01cb6c05bcadbf6db45088ff5b7
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification further support its malicious nature. The embedded JavaScript likely facilitates the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8521

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://produccionesproezas.com/clients/2/28/28ea8f13eb032e89cab2838ec144e7af/File/dovikufajetenilurimi.pdf In PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/49337780513.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/jokimedotizazunekodekoten.pdfIn PDF document text
    • https://signika.pl/Upload/file/17981220445.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3de97788c5---lizodirizuba.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2106231755447344331fi6npz84lso.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/r8ft7l3s6eo6nm14u525738dtr/13171497840.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726cbbc1c06---zanetan.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608caad988023---10039704294.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/fukuzejarepepusupijag.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fcd657b9916---mumujelarapuveriwitomaro.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/dipesefiba.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2154721393.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/niropilebijigekinitezapez.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/24357559205.pdfIn PDF document text
    • https://ranagro.com/files/10578646135.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/69945687060.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/nagoxoz.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/75876723410.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/40512058435.pdfIn PDF document text
    • http://seamacros.com/upload/file/fodifejumovuvivo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e98358e5f38---53348030945.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/nuzas.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/c84f351013ad04d9a6e4ad95fc876413/33298297304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+get+free+gems+in+frag+pro+shooterPDF 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_off0000ee80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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