Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a5536125c43dde…

MALICIOUS

PDF

123.2 KB Created: 2021-06-21 11:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: eaf7d89a47e96d1f0de769a35d2c98f5 SHA-1: 783ce760eca2d7b7cf6d0f61f84753d5e1aff374 SHA-256: 54a5536125c43dde6ae501c75e0017bccb080daf2dd6dcf6d63eecf6735ad560
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6ef750bba---34918171041.pdf In PDF document text
    • http://apexnepaltravel.com/userfiles/file/zoxugodumavemenunigapozuw.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/55567020b7297d0fbd3c6b2d575131da/83451773939.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/4973869f2318eaae8cd9ef3f0eeaba18/matopivokivu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/kafiliritidef.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e8aabdc8ab04ac21cf9b4d833331c290/kivutinikomaxa.pdfIn PDF document text
    • http://jinohair.com/upload/files/866075445.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa211ea64f---lisonuvuxigu.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/73717955679.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16095e4a9c4833---raxunopapakexanat.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa2683ac8---notomifilolijok.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48bbcebf30---gubexaserukazegaralanel.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/46fc6cac489f8b8eeaf0615ae4147569/ligeroginevejunevurudin.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/57444982686.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/bm3fpk1fpka07f50eiml07l6h1/59047642239.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/o4rkdgja8r4tkp735kt3m6sfm0/84964016142.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ce90bbcbb55---48315606246.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/fevakasukasifudojonagokat.pdfPDF link annotation
    • http://chiangmai-clean.com/user_img/files/rurujegitexanemef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pokemon+rom+hacks+that+can+be+randomizedPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E20 5404 bytes
SHA-256: 0337a4aa300bff2ed43dfe03cbd5425d861952aa6389da8885cb0dfff78bb0a6
font_01_sfnt_off00019053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19053 2640 bytes
SHA-256: dff83009bca0a044858659436ed021950636e27c1fc302a5fc8ba4c918596057
font_02_sfnt_off00019ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BA7 12036 bytes
SHA-256: 0985d23cb967b1e3b6a09f83c606da80f07aa0d9fdbd2e861ba92aa1669aefea
font_03_sfnt_off0001c488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C488 16960 bytes
SHA-256: 82aa0abadfdacb85161caa2c2f7346a52d13373f3767a07648c791692522a3a7