Malicious PDF — malware analysis report

Static analysis result for SHA-256 5931ea194337ab36…

MALICIOUS

PDF

100.7 KB Created: 2021-09-08 00:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 421e95ea6b1a4b295398b02c949c0005 SHA-1: fb08a337691f0e3c4896af3b756b4988656f9689 SHA-256: 5931ea194337ab36c4a40f680771047dd04e7bd2ec83decf4eed1bab058090cd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5847

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 http://neoneofytou.com/ckfinder/userfiles/files/nafewovevukaxibiv.pdf In PDF document text
    • https://nanyangtextile.com/userfiles/file/rilebataralagaziselawak.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/witufaruvedono.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608029ca2aba5---tezakinofelametabi.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/8093687159.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c989b85c3---rejabezaralasojakib.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/75128240986.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/c1e4ddfc3da1174313fe671b39ac8f6d/lewituvupavozuje.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/xonigeguzumufaxiwab.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/dikojig.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8e610ff270eb9c31914e00d58eabfa25/41430727716.pdfIn PDF document text
    • http://texmet.pl/userimages/file/64265249925.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/8240e76d8f9b09b4eed5a9d3d7fc8128/10845112712.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077718108502---7070316593.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e926b3dce482e9bf0d64ecf5a016313c/tozokik.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/5f0ada0797a8396ff920a2619913c4d0/54398169221.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cada32c7e40f76ffb80bde3b98a35d97/46659760156.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/85632957121.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/fo1lgq843e53hlrk54udqla0q4/vilurit.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/15170c56a2da895f25db72fd1a8853cc/vivuso.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/oe0sp15hsclv9sjasg3udkpvt4/paxiwosoxugapazekota.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/25om026cn1rfb3ai92c9ffdam0/gikukogepajewagatav.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/rsn19lq2gcth3dg2l7g295po6n/dopavakum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=chinese+remainder+theorem+proof+pdfPDF 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_off00016297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1