Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff427b405c3e3d7a…

MALICIOUS

PDF

69.2 KB Created: 2021-09-17 11:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 63bab541dd667f70eacc8c108ebfdd72 SHA-1: 2641257befac9d38d8c1b5e10948ce4da53fa8a8 SHA-256: ff427b405c3e3d7a02be6c2c9ea5369d1e96b1914ebb3658b762d2bebfad5dc2
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The presence of numerous external URIs, including those on compromised CMS uploads and disposable hosting, suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://globalathena.com/ckfinder/userfiles/files/95608527112.pdf In PDF document text
    • http://ms-domino.eu/images/file/files/fovemokagedalip.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/gafomolamuzojutivujuw.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/53610482981.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5ef34ff0f---56537063958.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/71084682886.pdfIn PDF document text
    • http://suyogmaratha.com/editorimages/file/nagawuxawimuxo.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/37735351646.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614232e34675e---julisuvafafululawelusa.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613780b3af985---90089549498.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/tibovusawogo.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/jagiwajonalitoxanokanuk.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/20141544769.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/33950953819.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/lugiluximegesomunalumevi.pdfIn PDF document text
    • https://kueapem.com/contents/files/88229439782.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/1646a8159ad70f03027ae57a59daf7ac/zatotetibotomimedetunu.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210913073321.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/sidadamivegubifafarewuf.pdfIn PDF document text
    • http://dfanchem.com/upload/files/32373377295.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/83877992379.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/nijupoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=csgo+crate+clickerPDF 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_off0000af0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0C 16580 bytes
SHA-256: fa7a944541ad3c66e5c98ef1a4706ee624c2422f9fe74e3f74de8a710dee77eb
font_01_sfnt_off0000d7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000effb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 10424 bytes
SHA-256: d9d5a39c6a269a5deefec1178689fc53682a87b714aa2bfefe21bcd46ba56def