Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8195f23bb7be93e…

MALICIOUS

PDF

68.5 KB Created: 2021-09-25 00:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 300aec931eb27e208676914eefd86baa SHA-1: 88f79cce944554aac91f8f8c7054d8f60cffb4be SHA-256: f8195f23bb7be93e4a7b4b6708323fd2103d5b9747c0440cabcb3cbb9ffe6ce6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the compromised hosting indicates an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://maility.pl/_ADRESuserfiles/file/84981941501.pdf In PDF document text
    • http://glovimex.com/uploads/ckfinder/files/84498718731.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/10805282311.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/e8kki13mgu0t2kjjb0cselbug3/zalonugafemi.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/vuribekoj.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210907181510.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/jarukikoboxukedabatano.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6e69fed30e6a19407f8877227e4b54d1/luzitobobokuxekusupuw.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/rafofanidipanu.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/19203638646.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/suganu.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/54151895086.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/60b69e0eb749d41bb669e482bd194008/38713055368.pdfIn PDF document text
    • https://ferropula.hr/files/wexine.pdfIn PDF document text
    • http://winso.tw/userfiles/file/31118721180.pdfIn PDF document text
    • https://nexusmediation.nl/files/fujenuxixubonulewesulug.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46809970059.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b505023b45fab9bf869ef9c1b857f101/16217437865.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/91963737654.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210902060015.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/lurod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mulan+2020+english+full+moviePDF link annotation
    • https://easyown.ddproperty.com/datas/files/38474203074.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000ae5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE5E 14940 bytes
SHA-256: b549bb57a0e8dda5d8acf51537b57bc0f6227d0b0a967a3dec9b2827f3e57f08
font_01_sfnt_off0000d3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC01 10864 bytes
SHA-256: 3f6f26df29ad8329c3f9d06db21965ca987af9c786a4663df267db8baf80dbf0