Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfffaaa25d2af5dc…

MALICIOUS

PDF

70.4 KB Created: 2021-09-20 15:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 621b854e08945dacb671ef9016bb2bea SHA-1: c616b1ca30ef4d41d0478b71a7e295558d83bf52 SHA-256: dfffaaa25d2af5dcd9f474997d3dd5c325ff4c90b3b2a306d0a797ea02cde658
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URLs, some of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://synerhu.ru/uplcv?utm_term=madout2+big+city+mod PDF link annotation
    • http://cbcom.eu/ressource/site-image/files/52098935528.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/zumabujewejuge.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/0a7c1212500222f1761f93220b8ffb5a/70033904106.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/18651750215.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/talukukupi.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/gimunomijepavaxeruzabu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/748k3tjanc065h2livutmfneah/34613572346.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/73710960934.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614018557923b---91946321245.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109100535388691.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/79289357807.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/luvixobu.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/27817410457.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/88014244091.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/45863079736.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/80127087510.pdfIn PDF document text
    • http://davcpundri.com/css/file/41987417676.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/8721427370.pdfIn PDF document text
    • https://agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/zivufutelokajajez.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/55094908961.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/53043448066.pdfIn PDF document text
    • http://cobmedia.hu/include/42188538643.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/pijajutemugomata.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/mejejox.pdfIn PDF document text
    • 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_off0000b221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB221 16704 bytes
SHA-256: 209ab08b6cdf3d192e2c83640f0050cd9612a811dca6e0e529bcad97a003e1d0
font_01_sfnt_off0000dc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 10628 bytes
SHA-256: 3f2c8a55cc1cadf95a58a735d5e22bc1290f33c0278f140dd1ced2e5aac90be5
font_02_sfnt_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.