Malicious PDF — malware analysis report

Static analysis result for SHA-256 781b07fca63bab15…

MALICIOUS

PDF

83.2 KB Created: 2021-08-05 04:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05441164be112eb41a9f5d8968d94b7f SHA-1: 6061a1e45ba8de00f7c6c5e60f3f16173c3a2655 SHA-256: 781b07fca63bab15c75973bf664d8a59563e2f6e18d3b040dd2d678d1f6d998d
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially compromised infrastructure suggests an attempt to obscure the true destination or leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://designerhouse.ru/upload/files/68252559039.pdf
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/94725816222.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160999f4ec71da---48743547490.pdf
    • https://guapa2.com/admin/fck/file/44973480027.pdf
    • https://foundryindia.org/userfiles/file/fafasuxejeneveb.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160781a3c243e6---53328884180.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/84a4cba676cee35b47299a212ada3c0f/44400574116.pdf
    • https://holocaustresearch.pl/nowy/photo/file/47371470538.pdf
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/wesit.pdf
    • https://karinbentum.nl/uploads/file/37654144374.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca083be5dc3---pabunuwematuw.pdf
    • http://angarakshaksecurity.com/userfiles/file/52339394572.pdf
    • http://www.sealjet.mn/pictures/files/mesuji.pdf
    • http://www.gonouvellezelande.com/files/mivezorububujak.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b28a34cd8a---60003493693.pdf
    • https://villamishkan.com/310renonew/front/images/files/kipawebevigudesimeje.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c299fc34f42---fozidividorarafovexa.pdf
    • https://foundryindia.org/userfiles/file/fodepe.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/91v2pqmscvb7n3i6kcob8vv24g/zojidowozav.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/dblqshs9sige9gtndp5ahj3bf3/galafologijut.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb552ddb89---dipetosuv.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607359e1cfaba---gaxemurazurevogolelan.pdf
    • http://fantasymusic.it/userfiles/files/89399733697.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2659e940698da2c2ebfb544c82efd092/fuxanajo.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/ed59e54afa6e1576dd3167d570b9354e/nedana.pdf
    • http://moestuinwebshop.nl/userfiles/file/95522441033.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/52u7k4lgpg0lmu3r5sr76037p5/ravumeduwugakodavamixega.pdf
    • http://businessvaluationapp.com//fck_files/file/34293920235.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=aqa+a+level+biology+book+2019
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1fc.bin
7fddfc42aee2eec645d6329b0efe469eb03b2c12b26461241e80deaa73af1cb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 10816 bytes
font_01_sfnt_off0000fac8.bin
3ffc76cb5040ae277a6d52762bcdde8bf19b7dbed3455a59ee11186fa5fe82e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC8 16240 bytes
font_02_sfnt_off00012497.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12497 16792 bytes

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