Malicious PDF — malware analysis report

Static analysis result for SHA-256 692b5e5f363bf311…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 16:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 20b1c1a27f941de4aecc68ad0b38fa9b SHA-1: fcf262d6df52dc7cc18adf0631e72f2125d984a4 SHA-256: 692b5e5f363bf31193bffaee8b4cc4da0859cd8de2dacb4da9b14071f6125b6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially used as a lure in a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://purmoradiatoriai.lt/images/files/tizojarukajivexot.pdf In PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/muvapufudipotukises.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/62339334221.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/tekolorokatokogut.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614672ad41ea3---65282416190.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/90124111818.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/2e4c40df14f28ebe083a5024bc6a500b/18069469383.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/99704087351.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/24528204273.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/66891780648.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/49451080547.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/99825592412.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0c904fe6d---xapalarofa.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/62453608872.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/5911478374.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/75310305998.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/warevejezepapuxusoxeza.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d89f410b3b---zozegav.pdfIn PDF document text
    • https://o-dance.com/upload/files/zuwajezugejepo.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/63243118483.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/40526668999.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/86383109844.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/mevoj.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d60e426343---13888826570.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210904120658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=last+day+rules+survival+hack+apkPDF 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_off0000e09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B1 18072 bytes
SHA-256: a898ef1b11dd67e765c1a0ef963704ac25634f2361015a240a3a99884a63a10d
font_02_sfnt_off00012791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12791 10716 bytes
SHA-256: 25e09e711cc62ea769ea254b6d1736a9af4464f68059732993c3289794797047

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