Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85e76cb4c0a0900…

MALICIOUS

PDF

86.6 KB Created: 2021-09-23 13:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2bd492f70f0da850f44f900abeddad3 SHA-1: c4eab951bb932fabfcd6c10aa3f4d964ca52c941 SHA-256: d85e76cb4c0a09008612bbebd0aa284e9d6c6721ad58d606b79c818a27554507
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161491d3f6e3cd---19870402933.pdf In PDF document text
    • http://eros-arena.name/eros/userfiles/file/34915503840.pdfIn PDF document text
    • http://runo34.ru/attachments/file/56482183954.pdfIn PDF document text
    • https://longhoang.vn/upload/files/41422397653.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/xijowogaxixaniribixokejim.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/xiwejuborubuwusip.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/2946456076.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16140fd352cfbf---501849461.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/robutuvix.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/26276466683.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/87192959273.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135954238370---xunepujijarodujisob.pdfIn PDF document text
    • http://partnercable.com/files/51992784411.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/fijebozaxebiguvezewap.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4dd91246d---tubapuniluwinifozufutes.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/kibiji.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/muwovemugelunuzuwanelijox.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/38557116706.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/63394362353.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/44300496626.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/54200508111.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc0f988f93---88240159818.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/26938579607.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/35679830124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=50+shades+of+gray+movie+freePDF 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_off0000e5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B8 20296 bytes
SHA-256: 9da13f40ec5adff4dcac8fb146a9be7a1fff2ab8193d931a375679fca3c0664a
font_01_sfnt_off00011b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A7 10892 bytes
SHA-256: df1f28cd7cf0b0caee1474c4718db9745e0897c38dbfb8cea5d82186abbf385e

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