Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7dfa99bbb38daa2…

MALICIOUS

PDF

91.6 KB Created: 2021-09-15 13:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 00f9d430933ffc12c5f73c79636671b8 SHA-1: 1dbc5b5d01cc9e60287d5c881e2f2ca20de2c577 SHA-256: c7dfa99bbb38daa2bd98d7cfdec9a1e86742af0d7ddb2d840ecbfb8b9b685091
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and link farm nature suggest it's intended to facilitate initial access via user interaction with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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
  • 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://www.heksan.com.pl/file/laforob.pdf In PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed446ad2f3---32527173631.pdfIn PDF document text
    • http://nanopena.cz/upload/file/nizevafovojexososos.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/10696723679.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/1f4d6bc902e4bb5001218a3b6c4206a6/lonowe.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/nuxutenudino.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/28733689628.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/jopijanerikidote.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/25802506403.pdfIn PDF document text
    • http://hmed.vn/upload/files/29264753215.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/5a97dc8fc9a9f9e44a40c675d8784cae/nozilelujawaraveza.pdfIn PDF document text
    • https://majubesar.com/contents/files/74891445936.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/45754028833.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/19364308572.pdfIn PDF document text
    • https://motoralbini.it/files/file/zetorigoz.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/koromobiwavejogenos.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/bavuxifadira.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/dujipevugixeke.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/nusujavipagukomuxev.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/bizadekamulafopagu.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/5977847619.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/mulisovelireresota.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/tafolotalut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=for+all+time+full+moviePDF 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_off000104d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D8 10248 bytes
SHA-256: 7262a745a5ea97b26b7d3de4a032cf6dbc2cc0b21da2bff14297d69092d74662
font_01_sfnt_off00011be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F5 17376 bytes
SHA-256: 97b78943750b5db9489c4eb230d2eed4fb46c6350597aa59a027dc202420f565