Malicious PDF — malware analysis report

Static analysis result for SHA-256 878e8094a394e266…

MALICIOUS

PDF

80.0 KB Created: 2021-09-01 22:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b5448577f6664d18750e54c618c780c SHA-1: bcb7bf9b97912f5f6ea101fcb68cb4976f8a096d SHA-256: 878e8094a394e26660b27a4b7db471bedfcf249cadf3904d66324a278505c1e9
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits PDF vulnerabilities or contains malicious links. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the overall structure and URL findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5550

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 https://chaletsuenodesol.de/files/16494268243.pdf In PDF document text
    • http://robbes.nl/media/files/vazuzor.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca801b1f59---83883822728.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ac1459f68a5d81a165ae62f3bcecdc46/46874019279.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/98749464230.pdfIn PDF document text
    • https://vestol.bg/files/file/warunumi.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/vivizepesezesusaz.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210701/file/16251366582930.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ae64e87d475---lakoxuvovopixabutisatifib.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608b91d7a271f---tarinadefazejupuki.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16073412770c58---lapusedizetuso.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/68469099407.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ae3009b16---17765263867.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/v6iked306rukgm757b3c1kj021/tudedokafonuv.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161251386e0aff---timojerexefudema.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec87469e94---vuvek.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/fijuf.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d9b68f17d---wigaba.pdfIn PDF document text
    • http://limoride.net/gallery/file/30693700327.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/fe9adee8387de11c2463a6971c463db1/sixamujej.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160845fb68a219---fifipimab.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/manutikeliton.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/66645169477.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/b56a1eeabb81fee223a3cfe9aff3f49a/28433743924.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7156761ac---gafoxede.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/jozinafomiwafepujij.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095eec460b1f---68459454860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=adding+luts+to+premierePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB0 18208 bytes
SHA-256: 0472deb2e6fb5614de6e19acc938461c9bd9dafb56575791c1fb3c7ae3af7012
font_01_sfnt_off00011976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11976 10656 bytes
SHA-256: 4a0887709b87f7bf13dad4546fb45a88536428ec35a3fae1ceb74148df46daba

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