Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a4b64d4b9f5fa0…

MALICIOUS

PDF

70.7 KB Created: 2021-08-18 12:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 31a9eeb4389072f1428102f4da1843ac SHA-1: 1939518c83bed0c0fb233893a3363206c07ac488 SHA-256: 15a4b64d4b9f5fa06ebe1958d5b5f5da0c64438cf9b1be4498ca14ba50ded1a4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware delivery. The embedded URLs suggest the document is designed to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6691

Heuristics 5

  • 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.
  • 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 https://marigabung.com/contents//files/nularumolavezasoro.pdf In PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/74ge2lrv79afh80e9n36t9o0i7/mozimemepobebugi.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608980ffd3cdf---bawanikikomuwa.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/napolokazow.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/52496075568.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/javovisoxuwibumilopi.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/40643852872.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160883789c0922---lurirenuvipafikejaxajul.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/79660a0892888863fa7fc8b1ed7496aa/45509626888.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/58942528834.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/34212136607.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b292b757393---nakilo.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608169f7b46c1---jatofupetuxerinorope.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/14029111437.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/8581485725.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16110bf64b3cf8---tuvaboxewopotulutu.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/loxubew.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a235262c268---43352723194.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/litudosud.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fe42afa29---66396027227.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/8077223545.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/45546902776.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/zasorixariseseri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=greek+and+roman+mythology+names+listPDF 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_off0000e334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE334 10940 bytes
SHA-256: eb4b96d1daf1e9c8f7583f31dfc1a6ef11142e898fd9d8c3d74a1c939f089118

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