Malicious PDF — malware analysis report

Static analysis result for SHA-256 63cf6e7d724b2258…

MALICIOUS

PDF

64.2 KB Created: 2021-10-03 14:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 60c33c5aafd7fcbd6f66a3181c94a2df SHA-1: 6db29136d192014fc238659412f32708e7bd0c7f SHA-256: 63cf6e7d724b22588062fdf5db5def10c7ceae10d671049822e86584b6b5c554
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7168

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://senvietsystem.com/ckeditor/upload/files/makiparopa.pdf In PDF document text
    • http://dsacare.com/admin/uploads/file/levotidulimikimub.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/xonokipawikezosuzalujinim.pdfIn PDF document text
    • https://themalc.org/files/file/80099635050.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/ludiz.pdfIn PDF document text
    • https://magerp.org/upload/files/14986024533.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/safunixajutevazuxavoweti.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/mokolefosupepu.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/dikajanolubodude.pdfIn PDF document text
    • http://cobmedia.hu/include/vugedojekef.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109200857275762.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614036fcf0ab8---nematikisoxutonejesu.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/xikewosenalupalotasunax.pdfIn PDF document text
    • https://scalping.ir/data/files/file/wanogememug.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614866f5e3bf4---pewifozekurarifefud.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///88311180404.pdfIn PDF document text
    • https://onecre.com/images/content/files/jamumemukevabanifuz.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/welepinejizukax.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140455b1c349---61106867325.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16155c0e0c5082---42292326956.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/4077032568.pdfIn PDF document text
    • http://hypovyhody.sk/res/file/47474261490.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/99759932452.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lekagefukofukebusupibosog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=cable+beachside+resortPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65F 10532 bytes
SHA-256: ff174cd7cbcf9bf618b31fe9dbae3e083f8c3c75e541b99792b5391ddeed57fd
font_01_sfnt_off0000ce7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7F 19508 bytes
SHA-256: 4d3f8e995c028109329a7ac294488957f6d2be0ba35d89b5e137ca87e62805f6

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