Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7bbb6256271eae…

MALICIOUS

PDF

68.4 KB Created: 2021-09-26 18:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d8983878b7b5bf1959c8cd2dd4e1cd9 SHA-1: 01026114fdc0b6a78e4c94c85700f31fd79ebc76 SHA-256: eb7bbb6256271eae1a40ffd3f9f6abdf2e14e992642a640b91594374f3c19932
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were directly extracted, the nature of the link farm and the PDF's structure imply it's intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://le-bouquet.be/userfiles/files/33105884950.pdf In PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/momevufep.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/18103372292.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/zojunuziwumobidiwux.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/8034bb526ece7c70e482f163d17c04b3/buruvobuvevexu.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/80790378844.pdfIn PDF document text
    • https://telorgabus.com/contents/files/14091663430.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/20054353908.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/loxidatijozilu.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161449f51cc66c---juguriz.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-10/20210910003703221708.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/27147969974.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/xitavaxewiwonuvofazalado.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/91687442042.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161318fd0c5842---55706430665.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/pufegoletawifimisiwusudur.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/76850587494.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/64677626726.pdfIn PDF document text
    • https://faceless.me/userfiles/files/wiwewaju.pdfIn PDF document text
    • http://espicycooking.com/files/file///bunudewunilawagevogivavup.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/78974684716.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/46681308345.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/65881462736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=malena+full+movie+english+subtitlesPDF 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_off0000af17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72E 10860 bytes
SHA-256: aec05e1513438fd2017b994a4d0174c802f7dfbcf28ba26f6b82fe805760869a
font_02_sfnt_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 14376 bytes
SHA-256: 3763c14b28bf40a7a3cd052c6651befd413b6475d87fdc08fb98e7eef96fd722