Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d6428f8eb797ea4…

MALICIOUS

PDF

68.7 KB Created: 2021-09-14 03:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1da0c9db98e67695212ac4018ea41bc SHA-1: 7eb729ad3ce140338d2a8f618c3bded277c02035 SHA-256: 2d6428f8eb797ea41c6c541fb7cbcd44e94b54ca4436668942fdbfc63134b487
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, directing users to various compromised websites and potentially disposable hosting, likely to facilitate the download of further malicious content. The presence of numerous unknown URLs suggests a broad attempt to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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
  • 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://leeharringtonhomes.com/userfiles/file/deralarowazonazapomulax.pdf
    • http://dichvuhangngay.vn/uploads/image/files/safuzanitonejugexabadexif.pdf
    • http://abwcrainhwy.com/uploads/files/nilazinud.pdf
    • http://aristosaigonhotel.com/uploads/files/6125856468.pdf
    • http://designklasse.de/ckfinder/userfiles/files/penuwaxofojonodu.pdf
    • http://chikatere.com/Upload/files/sisoxasufuga.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b246f0a565---52147875677.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613976db831ec---23080339936.pdf
    • https://iwistw.com/upload/files/68398528752.pdf
    • http://bburago.info/admin/fckeditor/userfiles/file/83614967162.pdf
    • http://hissekurban.com/resimler/files/21273345044.pdf
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3994055049.pdf
    • https://myarchitect.es/ckfinder/userfiles/files/wurexovenezusala.pdf
    • http://pyramidplaster.com/file_media/file_image/file/77801915571.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/kpmoft9ntsisr17g3i7h746sm9/jolef.pdf
    • http://kuhomania.ru/ckfinder/userfiles/files/35007149137.pdf
    • http://af.ssla.ru/images/fornews/files/89527759406.pdf
    • https://rimi.sk/userfiles/file/39221809588.pdf
    • http://mosjob.ru/images/file/vusirugebezofobidesedezo.pdf
    • http://studioguidobarbieri.it/userfiles/files/29246259343.pdf
    • http://myredm.ru/uploads/file/93142970226.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/99091c86549d27db8928058bb3c9e856/9727561775.pdf
    • http://yuc-fac.com/uploadfiles/20210902225224.pdf
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pedise.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=chess+free+download+for+android
    • 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_off0000b08f.bin
0dad0cfacdc369ab618f16b1a298c4bbf453ebd5df612e8ad4fa56c2f4739b15
pdf-font-stream PDF embedded font (sfnt) at offset 0xB08F 14772 bytes
font_01_sfnt_off0000d595.bin
8a6b701c278b107d2bd89c88569cc2dbfa8f4db2ac76d3d73b9260e4b97e2c63
pdf-font-stream PDF embedded font (sfnt) at offset 0xD595 10468 bytes
font_02_sfnt_off0000ed5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED5E 16792 bytes