Malicious PDF — malware analysis report

Static analysis result for SHA-256 20cfa1e5d8a8065a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-14 13:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2e2cfa076050315e486514f0edce38da SHA-1: 1051a0e208628e52bfb6cb57c41369705126e01c SHA-256: 20cfa1e5d8a8065ad7b702e72b1c5f244311cbabc300eded9d6d07e4d0df6da4
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing or malware sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://khaskhaan.mn/uploads/userfiles/files/bojopunekufarunirexutuvog.pdf In PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379c168f033---15677933860.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d0b2c8d8---66098377929.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/14344923510.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/pubedevupumatomuwezijujez.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/xiwag.pdfIn PDF document text
    • https://hoavily.com/uploads/files/74420457976.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/47693290748.pdfIn PDF document text
    • http://scarpatti.com/files/85809582181.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613171da28f01---11210894720.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/watekak.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/sugomeputa.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/dipupolirul.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/woforubej.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132bb792c667---gemevegawulojipimesiniwux.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/55395181382.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/32372175991.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/sunhmvk6vbb1jd3epb3ut4brp9/26216431030.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/56483939806.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/345e48fe1784c5a9c907b33c21eaa7e8/49856717413.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/6013670001.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/66725051723.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/86674158730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=night+circus+book+pdfPDF 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_off0000d837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD837 10764 bytes
SHA-256: affa229205835e873d02d2fb3702e1f65460b240bbb1e0e114b0a877f2d47ad3
font_01_sfnt_off0000f0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 18352 bytes
SHA-256: 419a2d98b20702b6c9d504487d8400a0cb7334d1ddd689d584f828e4f6df1cd2
font_02_sfnt_off00012062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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