Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8169a22f560a8fb…

MALICIOUS

PDF

88.7 KB Created: 2021-09-21 05:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c3d037bd36b5f06c5a17854da32414e7 SHA-1: d88f7671684eee35bf770293a476cdce14270598 SHA-256: c8169a22f560a8fb381472a3cdd2d63af2f868c6a57b76800b789c53e2430654
196 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate it's a link farm and a browser extension installation lure, suggesting a phishing or malware distribution attempt. While no scripts were extracted, the presence of multiple external URIs and the nature of the heuristics point towards a malicious document designed to trick users into downloading further malicious content or providing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://mundolibre.cl/uploads/userfiles/files/dizosuteroligubuxi.pdf In PDF document text
    • http://sellmysayarah.com/userfiles/files/ziwex.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/rirumabogarelet.pdfIn PDF document text
    • https://cityface.cz/res/file/28061892409.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/nuxefimupenuwawidazuwi.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/tesig.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbc604a307---58950285859.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/45303292443.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/wekawunuvokakipimena.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631377735.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/tegoj.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467a67287fa---loxoje.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/73954193258.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/51700893108.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/22148503506.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/nofakonusena.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300abe6ef91---fananuka.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138719a04e56---gukidegebajogefuramureses.pdfIn PDF document text
    • http://kvrhousing.com/uploads/dodanizagadugekufulozoxo.pdfIn PDF document text
    • http://fluorescent-training.com/file/gijavepo.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/tatidixuvem.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/59154863760.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/66556206063.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/tovakixuvaxakesovuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=free+robux+safePDF 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_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE6 19136 bytes
SHA-256: 9ca87f2ff8e5119d0401c1e690b41bab42848bf7f83985483701e3b696c76c89
font_02_sfnt_off00013ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBB 10188 bytes
SHA-256: aba69604b7f499b577347c8bb075a499de6b96a593ca3cd8c7a4672214a14e16

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