Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0061c0b3bc2355f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 00:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 866462b2c91cf37e2e5a197939a18f67 SHA-1: c4c66593ef9857ec73efaeb4638174f6dee0e757 SHA-256: e0061c0b3bc2355fd0a305393d5b606689e2f76ba59fa7e60f1b76578404a0cf
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or exploit vulnerabilities. The document body is heavily obfuscated and does not provide clear textual lures, but the overall structure and heuristic firings strongly indicate a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://abcoegypt.com/userfiles/files/29104439353.pdf In PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/81b190aa2102c72f47d89345d12bb11e/tavotoni.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/gatubujidisalubixezifob.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/26965718547.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/b55238d751807b7bc45b295accee927c/96355619585.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/vozubejiwononeximimuv.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/bugapanuminojegifavugel.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5277aa5a4---delisesukovafasosuduba.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/xofovufajoxerorulatovofu.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/netumuzufotusuwumibep.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/sunaxisevoloponowodeloxo.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/zisegeviwadejutovokoz.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///57242321097.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/61952796767.pdfIn PDF document text
    • http://stisk.com/file/14750966970.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210919_AA710279C79A3215.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/fuwotitinonugetowegelod.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/42913617083.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161424b738b630---bekezakovo.pdfIn PDF document text
    • https://12shio4.com/contents/files/93290634947.pdfIn PDF document text
    • https://ismart99.net/upload/files/16017922229.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/36277020851.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/silezevopus.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16145d0c11c563---verinixugimalifufuker.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+increase+my+mobile+network+speedPDF 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_off0000d5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E7 17932 bytes
SHA-256: ddc9093f6559578e14c90ecfa0a55d079b27932a513c8595ee92513f46feafd6
font_01_sfnt_off000104c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C2 11100 bytes
SHA-256: 2f5f18c41c12bb7ff88f93bb8afcd92e8041d45eec61d4d790d743c2e3e41537
font_02_sfnt_off00011e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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