Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1e1e0dc84ddcc4…

MALICIOUS

PDF

69.3 KB Created: 2021-09-15 14:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a79b9fb3dc7f04a574560ab682bcd4f5 SHA-1: f933f3249dc5750690ef834adf4e5902e6d7fd71 SHA-256: 5a1e1e0dc84ddcc428469e478b590bc67f5aa17228b7d20c9c1caa0b37132d79
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 a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The primary purpose appears to be directing users to external resources, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5779

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://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613292cf248bb---83894007269.pdf In PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614028e76e5fb---doberigutekibik.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/vipigin.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/79353755547.pdfIn PDF document text
    • https://nada70.org/userfiles/file/49797566287.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/xidekurajavubebo.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/28680110259.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/kefezedugekusokalin.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/36639474724.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613cb94076493---tagoses.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/jogidubanudedikajedozuw.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/xekibo.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404ddfbfdf3---velexulifizix.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/46332200586.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/95620277812.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/14662552321.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/gejakinilaxalipane.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/10300751174.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5973ef274---totepetavobim.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/12833161461.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/sodeburubelug.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133aaef8f320---49701272623.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/4643782979.pdfIn PDF document text
    • https://windsbs.biz/files/file/jofevogurebedoxaruxa.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/63069175133.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210903181738605.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/41099225994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=viber+%D0%B4%D0%BB%D1%8F+android+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8CPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8A 11016 bytes
SHA-256: fe48c8327e5355691d00f16a96df3445d5bd57b50176e69c3ce6af422d74fc76
font_02_sfnt_off0000e7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CA 16380 bytes
SHA-256: e20f1319638ac6d62e038bfb61794e41c6722a1afaf37180ebac22a32562fdb7