Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec7081fc281c859…

MALICIOUS

PDF

94.9 KB Created: 2021-09-17 07:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f9140da94b6e7672bfca270185b5462c SHA-1: 59dd534a9d4d6bfc591f802dde3ad2c55041779e SHA-256: 3ec7081fc281c8590ee80e89389ac229067b7ddea0cae8d697194956bb124961
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the links and the PDF's structure indicate it's likely part of a phishing campaign or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://phukhoabacninh.com/images/files/7124747148.pdf In PDF document text
    • http://zensushidanapoint.com/uploads/files/nodejufusegopojogajufi.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/mujisatezovagovepafuso.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/janimidaduwifoxuzuja.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/vazur.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/jozepigogalupumuwaju.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfc02c23ac---ninenetedojabo.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/juzilironumumeperi.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a928be0a73---nepuvawagataxo.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/52752572278.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/20673114851.pdfIn PDF document text
    • https://sitarasign.ir/data/file/kididobopoguzanixiwo.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/24120854444.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3usrgne3akkpi0ksmqrdd08le1/juwiwiwizawibubixirat.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/45810967027.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/palekogowi.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/vobudodawik.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d90f12dda1e45fe79140f2689b491d38/32377355321.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/86620889525.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/wexenawibovazidukojati.pdfIn PDF document text
    • http://jump360.co/upload/files/20210916184814.pdfIn PDF document text
    • https://pontus-sd.eu/uploads/file/semubosemox.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/luxuxolexekawigegowixul.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/95187628119.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/63272149220.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/2365263291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=redmi+note+8+%26+redmi+note+9PDF 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_off00010daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAA 18972 bytes
SHA-256: 65584038180ceb54086bb6f2edb4ea2a36710fb03561c1fc90f4864c4cb0137b
font_01_sfnt_off00013f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F15 10184 bytes
SHA-256: 6212cac9b7241ee545e4195bc44ae95f35cde771bf544e8e76ea3e868fee586b
font_02_sfnt_off000155dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.