Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a99e73b4dfbe24f…

MALICIOUS

PDF

69.9 KB Created: 2021-10-03 23:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ec2411e6fcb9832839338d5d90fbd3f0 SHA-1: fcf0a465a145ae2369811f4becd2b0118868b1e7 SHA-256: 2a99e73b4dfbe24fb302a2a0777c7e627fc78638914782f404941dff2a7ed2db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of JavaScript suggests an attempt to exploit browser vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://trieuduong.com/images/Download/30190672295.pdf In PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135dab6bbf03---tesixabaviresogadifojeku.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9f463ea0---26196529722.pdfIn PDF document text
    • https://558com.vegner.com/userfiles/files/20210920_082527.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/43358115411.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/kekumesigarawatulawavar.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/72528772265.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/18292304740.pdfIn PDF document text
    • https://asken.as/bilder/file/55830663386.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/daxetepiwovasuwalomim.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/v2lbhdqc2u4lft4oamedm2b5n5/5107414145.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/169s84pdkck886qdag5rc4rcs1/suwenipajelutal.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/fadovetukudorase.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/55435982651.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/3314131.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/82649371428.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/dozixalidixa.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/kamut.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/42316590215.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1632567957656411820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=answers+of+real+numbers+class+10PDF link annotation
    • 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_off0000acf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACF9 10788 bytes
SHA-256: 63b0648bddc410479c8c4c61e5ecc4ca344e572e02d4c5ca17be3e0c798557ec
font_01_sfnt_off0000c5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F7 16596 bytes
SHA-256: 1eaf8cf1479004608cbb3cfc95ada362903ad39e1dae16f6ed741b60e09842ce
font_02_sfnt_off0000f082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1