Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c20fb43e90ff571…

MALICIOUS

PDF

92.7 KB Created: 2021-08-21 06:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 3c0c5bab80cfdd42117a97902efcc60d SHA-1: 6db7e48d519a00da45e90b67a56c0a20084a090e SHA-256: 9c20fb43e90ff5715afcefe8c645d3afdc6a4b4e5c1aab13ff9710f4114082fc
154 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6123

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://inwebjor.ru/uplcv?utm_term=understanding+history+by+louis+gottschalk+pdf+page+41-61 PDF link annotation
    • https://istanajp2.com/contents//files/6977695072.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/24366604153.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/67863691991.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/mizademijilowevemerizak.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b340726a1---12009265453.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607285a59fbbe---dinidewageve.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/61569616270.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4b143d0f35---teduvu.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/xupitugonolidebika.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/504c6d0f2966b405b9683c9e29e4644c/xafiwebilemavedujelepame.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/3150638819.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ec533ab35cd---xikerilodugavutix.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/xozabijilufuvilatupafuvig.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/48e6122ff20a46e64a99c61014cc342a/vukewabugiruremusufaler.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160808fb67c4db---85187204184.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0ca6b9125---kisinomokisafe.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/feduwopokiz.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7fd8e8f5f6---jekinoxunedabax.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838f60af2c5---71978423993.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/71c1d3a5799f4bd451d3a8efc0e33342/49018245718.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16073b41de47e6---37221290502.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/92bec9e120f7eca9487ddd2cde0ef2ed/sotilorujeje.pdfIn PDF document text
    • 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_off00012ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD5 16496 bytes
SHA-256: a08032cc8bb787a0b98502ae09831b20af4100ec3d0cdc8a52c66e28802387a9
font_01_sfnt_off00015597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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