Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21868bd0800d36b…

MALICIOUS

PDF

92.2 KB Created: 2021-07-19 09:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5edd5088eb918e0f1e8855c57266ade SHA-1: 21592dc3a029455478747836daee712bc2cd7cdf SHA-256: b21868bd0800d36b29818b6f0914e6e17582dcd7b7d9f7702ce17eb890fcc105
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. The primary purpose appears to be to lure users to malicious or phishing content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://georgefamilyreunion.org/clients/86186/File/fados.pdf
    • http://geteffective.biz/uploadfiles/file/10160101862.pdf
    • http://myphamlulanjina.com/upload/files/41406984823.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d5d86794c---44232053679.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/faaab4363a84832d3fc175577e5a8fb7/68071776432.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d6cf4bc0ed166b31f80ff40a05230aff/buloresorituses.pdf
    • http://glina-master.ru/admin/ckfinder/userfiles/files/49447338335.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc94e33415---bukekisarovofodisomurig.pdf
    • https://caribemed.com/userfiles/file/zegefuwog.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088452dd852d---misidelozulalode.pdf
    • https://plasy.com/uploads/file/vasotopoxobazulowizi.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087913add5aa---lofefamo.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/b1711345b8983a5feea09b6cac354613/kivorozevakozapoduw.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/k6bkaajio7acnppv9cbc1kcnm6/22320951569.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795cb311c44---23957244604.pdf
    • http://bhk-aindling.com/userfiles/files/58371440546.pdf
    • http://clubselectionvoyages.com/images/file/68366503182.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608697cd6355e---fufalufetivozu.pdf
    • https://otartufo.com/ckfinder/tartufofiles/files/1451757432.pdf
    • http://drkoopman.nl/cmsimages/file/37931919683.pdf
    • http://sethhukumchandschool.com/userfiles/file/xibawuzuro.pdf
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pefizubulegidabefod.pdf
    • https://ortechindustries.ca/ci/userfiles/files/nojiv.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089949c0da70---wololed.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=as+light+as+a+feather
    • 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_off000104ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 16792 bytes
font_01_sfnt_off00011d03.bin
0609042cc4b40db572423a5a637446439bf7274a75532665ce1aa7eda6b91f68
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D03 10248 bytes
font_02_sfnt_off00013427.bin
ed114d023d26ced73347205c76dc95d8c9a2ef8228a8889211b691609c8e583f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13427 18172 bytes