Malicious PDF — malware analysis report

Static analysis result for SHA-256 4965a3c1e05d5280…

MALICIOUS

PDF

62.4 KB Created: 2021-08-21 21:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ae62a35555d8214211e65717845faba0 SHA-1: 0da76d2f893ca29f5d1adf522d9294b989a75c54 SHA-256: 4965a3c1e05d528047d4b8d14d81ac2006416a21ee81d012f9f9025f0da29919
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9610

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.
  • 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://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f02327e99---99000547359.pdf In PDF document text
    • https://abugfreemind.com/userfiles/file/zitevitedenamonukadexos.pdfIn PDF document text
    • http://unsersohn.ch/images/file/kujigodabofilujeveze.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/donupebitasifiwag.pdfIn PDF document text
    • http://northcity.rs/slike/files/87236118503.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093377050b8f---1920974227.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j6ej7v56jc0vb2qi3p9n03pcq2/xizuka.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/vakanabosej.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/16875409699.pdfIn PDF document text
    • http://imbirimbir.ru/files/10220015837.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1d342c91f---vawagikepesubopininim.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b703e3c8c---13523937924.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/dagapifonitapifasifexufem.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8db12bef5c---34481297875.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/41b6cb7a053097d1bd65f9df7955fe69/45315406135.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160affabbbd052---gufufaxikol.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/61430042904.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/95888131325.pdfIn PDF document text
    • https://bangkoksolarpower.com/syner_upload/images/files/4803776085.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210803051121.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/79947068580.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610e6cc0c9be3---9132155391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=will+shall+exercises+pdfPDF link annotation

Related samples 8

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