Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5d5ae06b973f38…

MALICIOUS

PDF

72.1 KB Created: 2021-09-25 21:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 706beee1bcac6583d90037419e2c37ca SHA-1: 388e742fc4b67fcd7d54fc03d0ab94221ae908a2 SHA-256: 0c5d5ae06b973f38edeeeb05c7676689728c884e0eb55e57be070508cf4c2465
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It contains embedded JavaScript and a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded JavaScript (T1059.007) and the nature of the links indicate a likely spearphishing attachment (T1566.001) used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://svsteinfurth.de/radsportfiles/file/78077221747.pdf
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/2857793081.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161319f332483d---11122690907.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/romatavuke.pdf
    • http://ajej.pretty-match.com/upload/files/dupajobifivujukume.pdf
    • https://cfbadalona.net/ckdata/files/xodifozuxu.pdf
    • http://idealhca.com/admin/images/file/38263734957.pdf
    • https://abofahed.com/userfiles/file/92092992216.pdf
    • http://a-pro-peau.fr/userfiles/file/38223235583.pdf
    • http://caogenzhiben.com/filespath/files/20210920233401.pdf
    • https://piti.leaddeehub.com/userfiles/files/35302665211.pdf
    • http://atletika-pardubice.cz/files/file/pinowemafodi.pdf
    • http://kingsauto-bar.com/js/upload/files/genaralozomigufapidap.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613df27b8e0e1---nexavadudemekagoruxus.pdf
    • http://shopcloud.cloud/ckfinder/userfiles/files/pigosuzofawogunedo.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ca6bc8d347adbd5c2186436b6a077a7d/dunojonukelobasamu.pdf
    • http://yugang360.com/upload_fck/file/2021-9-12/20210912120157568142.pdf
    • http://kor-ra.ru/UserFiles/file/zasagi.pdf
    • http://www.enfersalus.com/ckfinder/userfiles/files/jigojitifujiguzitokilube.pdf
    • http://vntattoosupply.net/uploads/image/files/64558788890.pdf
    • http://urotunisia.com/uploads/FCK_files/file/lawadegolapinizupub.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=chimera+ant+ending+song
    • 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_off0000b330.bin
f881b8abb3d7759946305f0c8ae89ead3d672c8a88a642ef43f84fff045f6ef7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB330 18840 bytes
font_01_sfnt_off0000e283.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE283 16792 bytes
font_02_sfnt_off0000fa9a.bin
ab21697eedc76b8f6ef886d8294845e7a34e8dea7fa2449bc656c064f6a8cf44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 10680 bytes

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