Malicious PDF — malware analysis report

Static analysis result for SHA-256 820c7a2440d153ee…

MALICIOUS

PDF

63.7 KB Created: 2021-09-18 16:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8a5e11073aab8d1c7cf938001ba90f3f SHA-1: 54babf3bf3ccbcb1638b0bb2f5cd2f12deaf8e8a SHA-256: 820c7a2440d153eecbac4dc878dc8692491ad1fe58f75ccec738f1d4f09e126f
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various domains, some of which appear to be compromised WordPress sites. This suggests a multi-stage attack where the initial PDF serves as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5661

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://chcial.ru/uplcv?utm_term=love+actually+watch+online+free+123 PDF link annotation
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/95936995584.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/jolejevazitusunomozoxenu.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/64822142576.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/41246188729.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/75855080582.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/qlej8c227e2ehakha1uh45l9ua/77249447246.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/givokogitif.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/gorexoregimoxuju.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/47186042042.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345c3598e0f---vunonigonifutezuxemaluxu.pdfIn PDF document text
    • http://budropol.de/Upload/file/16628171710.pdfIn PDF document text
    • http://happy-land.hu/editor_up/34595670305.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/jigemelogovuxexabegep.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/lonuxudun.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/51352556878.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/sibimomukulukafigusabo.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/70861798637.pdfIn PDF document text
    • http://yilip.net/userData/board/file/73815423099.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/limedojo.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327234287d1---90532377640.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/78648827767.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/cmh9tq0ai30a2o93bbkhuffd8a/52383586987.pdfIn PDF document text
    • http://dsagco.com/Upload/file/17964193835.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_off0000ba3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3B 10932 bytes
SHA-256: af479c84a7aa41f88c57951c4fa8c269994ef8cc8ae6b82073bd798c1a56e079
font_01_sfnt_off0000d3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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