Malicious PDF — malware analysis report

Static analysis result for SHA-256 647b79b9640fef55…

MALICIOUS

PDF

84.4 KB Created: 2021-09-03 14:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2ff2d3333bee03ffbc756c671b46778c SHA-1: 9cc8eed1fdef60525e7da86081f8b57a5c78d749 SHA-256: 647b79b9640fef5528d80e5c5de4c1e86d1516b798d7767026fa47df5d3f1f9b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded JavaScript stream and a significant number of external URIs, many of which point to compromised WordPress sites acting as a link farm. This suggests the document is designed to lure users into clicking links that lead to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ff39742818b72faa1913f2524346adf7/rafenifufutepikubazes.pdf In PDF document text
    • http://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/16872939110.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092d41da7774---bujax.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/lumiferiwebekapoxe.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097408a9c343---59289888968.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e92e60912---widadefilofozunapa.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/19935510002.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607efa1a944dc---pikezuvi.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c656b72bedd---pifogoromibamozut.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/8ed5519dca606fc6c90901d7b5e47b57/13328454463.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/kubebatarapik.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/buvawevokitozoxiba.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/56353789581.pdfIn PDF document text
    • http://khocabien.com/uploads/files/jibabaroviluseluwokaro.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16097504295776---xanowosodufapig.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/60fc4152b4edddf20fc83e78ed755e92/mudujuxezevaweterijuj.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/81828832890.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/dojotoro.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/65354223810.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/vojiworusepidipoba.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/31070668931.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610d391e44d02---20632952586.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/dexigo.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/fekobuweviludubimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=zanussi+electrolux+dishwasher+manualPDF 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_off0000e155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE155 10884 bytes
SHA-256: 6976647a23379ffb3bcb363fa60b98e1fe3bbaafb01aa24577d38387f9108c82
font_01_sfnt_off0000fa6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6A 18500 bytes
SHA-256: f11ca37a17277eccd1363a49edd13b96f324630bc8c3d11ea20716e0b1c7256f
font_02_sfnt_off00012a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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