Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5346a709e1776ba…

MALICIOUS

PDF

69.7 KB Created: 2021-09-17 02:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1c9c8bdcfbbc36855eb70c0607e40c96 SHA-1: 8312c45c34cb5c681b19f97c1dfdcf4471fd9073 SHA-256: e5346a709e1776ba43b6973dfd409173be21b2ae5fac05bed810f24589f7642e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised WordPress sites, with URLs designed to appear as download links. The presence of multiple unknown PDF files and the ML classifier flagging it as malicious strongly suggest a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further solidifies this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140102b95425---powetukaparive.pdf In PDF document text
    • http://dentali.cz/files/files/lelumupobozolibafibe.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/53060558909.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/xefasoledatixesakajutewag.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/kedewanuguzejirunusufewab.pdfIn PDF document text
    • http://dmkert.hu/files/file/filagiratagi.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/tamuzalijusozulejasojuv.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/noboxozujugu.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/07/8501284393.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/35279807272.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/94845031019.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/gojobodasuxukozole.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/fakatiwusu.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/294c5c0bf93bf6921383272f847b036d/44484825913.pdfIn PDF document text
    • https://alohasafaris.com/files/limigoluxi.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/392439ae920454f60fe8d8e5d5f1fe9b/94279547974.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/42008707503.pdfIn PDF document text
    • http://rhondachem.com/d/files/87907265249.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/muzagefesu.pdfIn PDF document text
    • http://mobilenmr.com/files/files/fitasedomimelivowavat.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/kvvukrdgv82m0p6mqphminfhk7/26822388346.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109050007508204.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/bovuganijegomif.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210914130230.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/vofujuva.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/77011102530.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/nelatuperikijunuvugimez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=download+mario+for+androidPDF 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_off0000b5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DB 10204 bytes
SHA-256: c62cedcfbb51fb029ec69f8c95ed2ad2055ad59188661253ebe77930594ce40a
font_01_sfnt_off0000cc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9C 14540 bytes
SHA-256: 86f41491f7e90fbca43c7ecc375fd01f85d4b49a4dfd0453534ddfe3e79d5b45
font_02_sfnt_off0000f0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1