Malicious PDF — malware analysis report

Static analysis result for SHA-256 64325f0243bfb537…

MALICIOUS

PDF

62.5 KB Created: 2021-09-20 18:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1819370dcf5e5a9d91538b8aac90c5af SHA-1: 885f3608469824b400869abd454593aabf77e6d1 SHA-256: 64325f0243bfb537d80d41957220b80b898089349e10784a627258adecd56c9a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7942

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 http://chinalabware.net/d/files/90976552903.pdf In PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-10/20210910084812155697.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/zozanisunekixudo.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/37712044398.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/26421699090.pdfIn PDF document text
    • http://eksternest.be/images/file/pejaki.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613862816441d---32842708217.pdfIn PDF document text
    • http://abwrva.com/uploads/files/giratoju.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/25610654069.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161441dfa8e8eb---87819303623.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161413caba57ba---55199795555.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/89928432286.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/zarijivatokojatutaxel.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/29c6b5b33bbd415410fb48dee8ad7514/zekogekowivaz.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/50049133024.pdfIn PDF document text
    • http://shahgrp.com/uploads/pumumavobiwubevipusasufo.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/wojamiguledow.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/jofilijodulukaxi.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/mefij.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/7305820186.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210916_59013C557742EF63.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409e76337b3---6761331595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=hidden+features+of+redmi+9+primePDF 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_off0000d586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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