Malicious PDF — malware analysis report

Static analysis result for SHA-256 3811e299dd0f81a3…

MALICIOUS

PDF

77.0 KB Created: 2021-09-12 02:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e687c2d43551db967499f3d6b90c371d SHA-1: 74269808390a4d2aae46d780dbc0dc56d6b8f6b0 SHA-256: 3811e299dd0f81a356d2eb4340615710c02172b3c19af689cac882fdad3038c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript stream and the presence of a link farm pointing to compromised CMS uploads suggest an attempt to redirect users to malicious content or phishing sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://idroter.org/userfiles/files/58794645545.pdf In PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/govebexix.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161365ddf3c06f---lasatevada.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/tuwozejokubibosu.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130c84863aac---44519694022.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/25503863671.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/f1cjiv8fkh3j97cq53tan470j6/83625587350.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/xitanokugofilikagibo.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/gepunire.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/tugiwejuf.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/zadosopeniwovotapajubexo.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/80952617502.pdfIn PDF document text
    • http://mobil-tech.com/files/91823634113.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5053df60cb2f0213348fe739ae3e468b/rifofazuk.pdfIn PDF document text
    • https://nada70.org/userfiles/file/tabuxagajozi.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343fe817538---68467826913.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357a740cd4f---resip.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/salanelamagu.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/90300634827.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/22147667684.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/55396256921.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/nozirenarekubed.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/28654050736.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/nenukil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pokemon+go+cp+hackPDF 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_off0000c9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DF 17600 bytes
SHA-256: 24f65d230dccc1cf5131f7ebdd346307cf41acb7ad908f181e453cc0ce8b8029
font_02_sfnt_off00010f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6D 10408 bytes
SHA-256: 40cff0a2b76cfa84587f3f5f40ad6a84e40ced69dbd7bae9356518220ecfb820