Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e4bdf758531b7b…

MALICIOUS

PDF

87.4 KB Created: 2021-09-21 02:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ca0fd1118ab515dbb4575b71d5215a0e SHA-1: 6c2cdbeab5873fb2d3a682856ad2de64d07f52af SHA-256: b1e4bdf758531b7b90c3d4231c3115bb675d250b62407cfb05ed8e8e4e6d44d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm, coupled with the use of compromised CMS uploads, points towards an effort to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://6nergy.fr/6nergy/sites/default/user/file/37742963470.pdf In PDF document text
    • http://andlupa.com/userfiles/file/35445060506.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff61c07067---58803427766.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/770aa4b287bfe9e788bbbfadf82ed69a/labexel.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/mivemiridutij.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/90278893739.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/bokoxorakun.pdfIn PDF document text
    • https://superpart.com/files/bogevuse.pdfIn PDF document text
    • http://dakov.hu/_user/file/1226578594.pdfIn PDF document text
    • http://mamitobe.ru/files/file/31118359343.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/vazatoj.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/9506057564.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/18185690609.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/zejitemetemimifoxarosa.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/zumugun.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/nijazi.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/nuvewurafujumiras.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a1ad89fc7408b17a766dd65dbf2d8ae3/5035788591.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/54697809094.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/madefuzujesijajalujo.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/tujokizopuwo.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/oadn0bbp3u1inbk0him3dho944/vejisunotonozuvugonevugo.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/99899859599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=fences+play+by+august+wilson+pdfPDF 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_off0000ee8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001069c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069C 18180 bytes
SHA-256: ae6daf17bb17af4648f103531c2d9b330047707c18f552247312186bd5a5dcc8
font_02_sfnt_off00013655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13655 11112 bytes
SHA-256: 2b08c04f1384114935e19d36d3ded42fdcf28eada119737abb54fbdf3a301be0