Malicious PDF — malware analysis report

Static analysis result for SHA-256 821f0d544b079c33…

MALICIOUS

PDF

74.0 KB Created: 2021-09-21 23:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 516bb9f9577b47f77ac2f961095bc4e1 SHA-1: 76815ec6027461944d0f76fa1cef5bbd13928f21 SHA-256: 821f0d544b079c335cc125ccb29f9c019a87fb6b4c8240094e3ed3f1156e0489
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be part of a link farm hosted on disposable or compromised domains, suggesting a phishing or redirection scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://chcial.ru/uplcv?utm_term=wifi+hacker+for+windows+7
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/2438363734.pdf
    • http://gptools.net/userfiles/file/lazarelorilafeperifarawa.pdf
    • http://amandamaitland.com/images/file/40580338058.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf52b39a4---movimobi.pdf
    • http://thegioichuyendong.info/app/webroot/upload/files/44312698101.pdf
    • http://youngdongtec.com/userfiles/file/46606048396.pdf
    • https://rowsontw.com/shopadmin/upload/files/74407079394.pdf
    • http://bbdecontra.com/userfiles/files/xemonobafisawifu.pdf
    • https://perfecthospitals.org/FCKeditor/file/mulapopufipo.pdf
    • https://vas-vill.hu/userfiles/file/xuvesavowag.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/j1b1h74ql1b54qqa4j4ta9a7nu/60150839312.pdf
    • https://tanthueviet.vn/img_data/files/4334069113.pdf
    • http://studiodrago.eu/userfiles/files/41320119227.pdf
    • https://inarsindbari.org/uploads/wobenat.pdf
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zivom.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab28f29bc---paxekorawit.pdf
    • http://sevennews.com.br/ckfinder/userfiles/files/rajiri.pdf
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/10623369308.pdf
    • https://bandai-k.com/userfiles/file/kumibekimapejifuvukuloji.pdf
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41066156637.pdf
    • http://turar-mussin.com/userfiles/File/66828966910.pdf
    • 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_off0000bd89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD89 16792 bytes
font_01_sfnt_off0000d59b.bin
dcf363f38d116277902d17c1f70e4587e4c0d2dcda6161d080bb7296201f1db0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD59B 17304 bytes
font_02_sfnt_off00010295.bin
75555c413f1b0db5ca8f9b383b862c26570554191dda93e5a23ba299656dce49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10295 10648 bytes

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