Malicious PDF — malware analysis report

Static analysis result for SHA-256 e17b224d6d253d96…

MALICIOUS

PDF

84.4 KB Created: 2021-09-20 10:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 039f1df85ba5767f6140f8e3cd623da8 SHA-1: 6501ae580249a949c111aef44a37e93af37f3899 SHA-256: e17b224d6d253d966232c1cf30f0e6d920249c15f2182dde2a67202c042547cf
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the presence of numerous external links and the malware detection strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://sananselmo.com/wysiwygfiles/file/belulodunibene.pdf In PDF document text
    • https://snf.styleguides.ch/userfiles/files/63249233390.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/dajetakalim.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/47309008905.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/89266830734.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/jivetimesawonojopujawis.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/84420479448.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/2484233826.pdfIn PDF document text
    • http://pjteam.hu/uploads/tasidisa.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/de457dd09385cc2b8f9e877689e4fea9/vexabajimilosasuj.pdfIn PDF document text
    • https://phm.vn/upload/files/80943280792.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/30701233569.pdfIn PDF document text
    • https://blogsma.com/files/9988098001.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435a85ea2fa---41295656992.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/75281163126.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/25035594219.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/52520584000.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210919145647.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/dazokadelekoralagosudipet.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d08dbc9c7d---katenokokonudemapazut.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/80120740706.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/sokawezawunakuk.pdfIn PDF document text
    • http://peak-experience-japan.fr/images/blog/file/23755918206.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/98532021980.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/sajojofitefukakototi.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613705482f9b4---265628107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+install+movie+hd+on+firestickPDF 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_off0000e34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB60 18264 bytes
SHA-256: 5b9db94406cff589893d0b5ace4b31573f3d07ca16764b1ae25116eeba7fea15
font_02_sfnt_off00012a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A52 10976 bytes
SHA-256: e4330fef3ba89ea8f6c75d383da073332825fdb54254363379f01dcd9ce0edeb