Malicious PDF — malware analysis report

Static analysis result for SHA-256 0684c78f22ab1c19…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 12:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf7e7888ce6d34a268d526115188ccc6 SHA-1: 007838c084990070680645d997972a347fa2379f SHA-256: 0684c78f22ab1c19bda1701d7569087f4e50056e77c5fc9251369dafe7dd1ec6
196 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick users into installing malicious browser extensions or updates. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/63778c9b5cb3c7dc7ffc7a6e7de4752d/91692117634.pdf In PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/59366530391.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/2052318887.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/63076393886.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fe55a214e---77628192121.pdfIn PDF document text
    • http://erictex.com/ufiles/files/ponokozafunanabigemob.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/vugafemugotew.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16132f95ee6f8b---58847167851.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/60325412045.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/doterirom.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9fbb8a44---vorozuwareg.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135322f9bd73---favezuduw.pdfIn PDF document text
    • https://europartner2.pl/uploads/kilapolilogipugabuwo.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/19110952603.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109122305376806.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210912174610.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/fukedusuwitupikakojem.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/mobovelipeso.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/jabowukoxudujupiwulemit.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210913164558_si01ji.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/8182025175.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/75067419587.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/50815805692.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/fexilite.pdfIn PDF document text
    • https://stauber.lt/images/files/dadakimugevim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=keyboard+shortcut+to+refresh+page+in+chromePDF 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_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 11364 bytes
SHA-256: bc2afa2e6377bd9319d0d92a902b51f789ff79a4b46d4bc4f4b2f8816735222b
font_01_sfnt_off0000f57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 19076 bytes
SHA-256: cf3cda814a37c8308caf7a2818ec5f043f6afc4559d6af2455f7c3bcad8e67c0
font_02_sfnt_off0001270b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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