Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfcd463fc9fcf52…

MALICIOUS

PDF

79.6 KB Created: 2021-09-09 06:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 417392181f97b29e7f51b1b3a02f5292 SHA-1: 88e3378b4bbf03dd7875686d3beac0b3d4e27cd5 SHA-256: ddfcd463fc9fcf5266295fbf761f54988e5ee53e1a584393b9ab9b8b3a3719b0
196 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses a link farm pointing to compromised WordPress uploads and attempts to lure the user into installing a browser extension or update. While no scripts were directly extracted, the nature of the lure suggests it would likely lead to further malicious activity, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/161371c97b59c4---54066267723.pdf In PDF document text
    • http://slesnick.net/userfiles/files/66896712593.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/74611307886.pdfIn PDF document text
    • http://imoroz.by/upload/file/20497640408.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/3196422007.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/96019568548.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/jutufapuxejoxakiw.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210905053836191129ggkv8u.pdfIn PDF document text
    • http://honghuibio.com/d/files/faduduzuno.pdfIn PDF document text
    • http://roocenter.ru/upload/file/29121071010.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/19135993307.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/9a2721bbebf30bccbe32167f0a2e3e46/nuwasadawag.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630567767.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351f7299ccc---39689920886.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16135baf9698cc---78203018882.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/94919507616.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139468784123---rexotewikedewuj.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/24783670051.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/85787405877.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210831_165722.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/nupawavatijoxiwol.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/78801894642.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/timokadopuxemora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=interchange+5th+edition+free+downloadPDF 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_off0000cdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 19292 bytes
SHA-256: b4b8a1ea933375920dd1a55982ce62ba61775a18e472e7dd68789ac812ad5259
font_02_sfnt_off000117c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C8 10760 bytes
SHA-256: 3b67de3a9728d6205f984fa02fcb895992f0017c321dec42407fbfaa627d14de

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