Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2f806b530e5afe…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 20:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 28a5b176f2716d5f678a5de4c750a8d5 SHA-1: 01b85cec0db93d7fa637d1dfb7752731f313e6f4 SHA-256: cf2f806b530e5afe372ef3f939431dd99264ad77e70631a435847a5f09851c5a
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, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and functions as a link farm, directing users to multiple compromised WordPress sites and other potentially malicious URLs. The primary purpose appears to be directing users to external, potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 7

  • 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.
  • 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://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160982f51d6bf3---luzexodorazonefixib.pdf In PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/28458669188c3ca7561e98124f361bbc/nomexeraki.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/92786800968.pdfIn PDF document text
    • http://ruihuitax.com/files/file/jasakiwunivuvu.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/fenijavoliwirugetomi.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160726a8199f2a---romudovegezufix.pdfIn PDF document text
    • http://ropesadventure.com/d/files/kokasoduxeranizidusizi.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609404c36a3f2---kokijoka.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/tazokejafoxunapakalatit.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c10cee05c2e---misibidolojufidej.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/3d5c1a9c4033d0405f5bf8c5876e77bf/mufisutaxezif.pdfIn PDF document text
    • https://asi-filter.pl/files/file/veduwudinor.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/99068678211.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/mirajaxonaja.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/76811151474.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/kumazi.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a0cb82745---lofejebobovogamubu.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/eaf9fce32ba2d85f2dcee5c0d67069a6/19990532249.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/fikaletu.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/13520591873.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-29/20210429190520564742.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/gumixalivazofixamuzul.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/qa0jqoti1ltgdoks00o5dqlc7g/xevisememakekod.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/ctvb26dqnch6f04hprssedqdb9/6640101582.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/a0ab7487d925282c54747c7d1d69766d/24631147484.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef275ede72---72255721846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=play+golden+oldies+musicPDF 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_off0000df6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 10732 bytes
SHA-256: 3fa5b2f7a49c3747c77e6e97f5c2a772d2e5527229f77179d8fe6ea03d3429f6
font_02_sfnt_off00010ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF9 18376 bytes
SHA-256: 0a121371eebfc9433eb376f4395dddbd2837c549dc37ec7a8f61b0906285b422