Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bddc40cea435c20…

MALICIOUS

PDF

84.6 KB Created: 2021-09-15 09:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 05e3a199ac3d9e00858094a668d5e8b8 SHA-1: e00694cacef404d33c0a701699cc0210af8ed2f2 SHA-256: 1bddc40cea435c206e44714c36d9bfef7fec5a6dd2fbe4147f8c6e5859ed072c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/64431757711.pdf In PDF document text
    • https://ccaquebec.com/userupload/files/zerilitikusuwesukub.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d1b8d2b3d---deniluzugosurujikulowe.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/69288447815.pdfIn PDF document text
    • http://progetec.org/userfiles/files/87978223978.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613aae8f506af---jamaja.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/movirofujugugiko.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/5519150869.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109091820135558.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/piforatopanupe.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/tavorekupifazuwedumor.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409dce4aa0b---51916299063.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/9774531553.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/59516810974.pdfIn PDF document text
    • https://icbacademy.com/upload/files/48775511707.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/mepeledekuji.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/mitovavi.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/65410771907.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/32545415591.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1232e0047---71255653839.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/kipikilener.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109071633147874.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe6297cb9---23999736103.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/bemanusiluxesadofif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=auto+followers+instagram+unlimitedPDF 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_off0000e6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDE 10864 bytes
SHA-256: 9a764dea44c8bd0ba4f7814c016a3ad095753660b1d181886f670df634ee3789
font_02_sfnt_off000117d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D6 17440 bytes
SHA-256: ea04c5da2a9164657c4d167458cf0cfc8780f8ffa0a4f04259b0142b75a37c36

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