Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1559eda8053ae27…

MALICIOUS

PDF

88.2 KB Created: 2021-07-20 18:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e03bfcfe04e3e1630be44ec166f43626 SHA-1: 2ad3adf61226e8e59407bf86ae7481de8e4437a2 SHA-256: b1559eda8053ae27f6ed2fafa68d2187ffc21650db4b2a1f54d09b39feca8859
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised WordPress sites, suggesting a phishing or credential harvesting attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to download further payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/sffud3bee2aoi7ro4bb759ua14/jodalobuzivo.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c589be4e01e---46052336627.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210518184556.pdf
    • http://faithleader.org/js/ckfinder/userfiles/files/58300180462.pdf
    • https://himalayanthailand.com/image/upload/File/migikokevozipugobinovi.pdf
    • https://contact-house.com/fckeditor/upload/file/pelixamamutike.pdf
    • http://akcjonariusz.com/UserFiles/file/45046662691.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf2d025341---95573875066.pdf
    • http://transbur.ru/admin/ckfinder/userfiles/files/60456084716.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8890e1f312---53836673633.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/rrl78ou9ef9fhodg3qtids82v1/24490978901.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c39faa9f725---20953499789.pdf
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dadowalexafedutu.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/864ss07cfe9hm1v7npogsinudo/38424739794.pdf
    • http://tupnate.com/ckfinder/userfiles/files/15109392691.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/9sp0u4kuf1pacserdmlp7joftg/83303437721.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160e53366368b1---64506884658.pdf
    • http://accessiblevehicleservices.com/userfiles/file/63666000499.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d3690b7f9---nekoposeribine.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/5tuq5f4f64ghrvbl1s0uhoqkf3/poxigebaturovowexujojot.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aab69001049---bagusipojizuvebivugom.pdf
    • http://teerosy.com/ipp/images/uploads/files/69328714065.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b63062b9890---kuvituve.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720347a9353---zotudovuwakenobepofuwaga.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=wolves+and+warriors+tv+show
    • 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_off0000f40f.bin
768d5246184dbb2f889ea3d5f5ac1fec9d217095486180325ea8e2e5d226527f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 10492 bytes
font_01_sfnt_off00010bee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEE 16792 bytes
font_02_sfnt_off00012400.bin
e5b56dfe895e19369c94ec6f5c23dafac9f40dcd0a17ddd78459b3e40709f478
pdf-font-stream PDF embedded font (sfnt) at offset 0x12400 17664 bytes