Malicious PDF — malware analysis report

Static analysis result for SHA-256 e138632f16604320…

MALICIOUS

PDF

95.6 KB Created: 2021-09-01 06:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4c6ce3393d61d8b262e3b0a889c6395f SHA-1: d0e161928c4d20af8dc148ab7f3e18af3e57648e SHA-256: e138632f16604320759a804a950d05e4cd65017a029c3773f3a72356ace7db22
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution attempt. The embedded JavaScript stream further indicates potential malicious activity, likely to facilitate the redirection or execution of a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gptools.net/userfiles/file/44480365775.pdf In PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/o400t0e0120q1oossu15ugt37o/xusupajal.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/gilimajinijijimi.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210825075638390727wegd40.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/5v10e6b462cifdhj50shpu10ps/35840660692.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16080460dc528c---kebosupopumovexamepijimu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160757608506da---21792945921.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/xeraduga.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/97213908558.pdfIn PDF document text
    • https://majubesar.info/contents//files/govudovizinila.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/dujedekugis.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/16df55b8240a0cb573e24871aa5e2ec3/dofewerikukina.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609617d0db2cd---40213963760.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d52edd165fe.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071a57e97109---rogukekosorepuxufozututi.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/68383159378.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/pivosopoluwivibewobo.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/13553299319.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/vemulutotujepawulisobed.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/befex.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/nizixage.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/47845390884.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/iga2e14b8oromjt27ie9m86d91/19396451233.pdfIn PDF document text
    • https://combrooncom.com/contents//files/ruvozakiwovunagimuleta.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/3014e5297c7ecf72715292187338d8a4/tikevak.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/f3f4f074f13240018d978e5c7dd00053/volarulivujaredavivadogos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=lds+general+conference+october+2019PDF 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_off00010e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E67 11120 bytes
SHA-256: 98618fcfc708f99e60e5c8d58320a55bf95031b21d717615099b569952f9deb4
font_01_sfnt_off00012856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12856 18168 bytes
SHA-256: 4c6e4a89c64c49e17a2adba69406c73631ca645cb4a214521c10170efd9c2b55
font_02_sfnt_off00015758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1