Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64d01811c2aa01c…

MALICIOUS

PDF

84.5 KB Created: 2021-08-21 22:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e6bce94adf38f267dd71a1d6e5f58d62 SHA-1: acf92154dab8e7369da559bdc6433702f10600c7 SHA-256: b64d01811c2aa01c87b4928da0eda1dd9a02828da48ddf0753bb8e5767b97af1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or potentially disposable hosting, suggesting a link farm or phishing lure. The embedded JavaScript is likely used to redirect the user to malicious sites or to exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9abfcda62---28201803258.pdf In PDF document text
    • http://abw10thstreetne.com/uploads/files/39789541608.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/jetepumesex.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/xukivenewelaj.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/jativar.pdfIn PDF document text
    • http://codefon.hu/js/ckfinder/userfiles/files/97811741311.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/mamizevamazaxazo.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/zanadivopevimojijulamun.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/vorulewalu.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/6no6mga5rm3pm4qf7o47kbl4o1/49404450878.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/jakuxemigita.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacc4cbf26c---4615498869.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f791f38c8d---rifetaxebezubijo.pdfIn PDF document text
    • https://brakos.it/file/50049053823.pdfIn PDF document text
    • https://limsurempat.com/contents//files/nukusilomuzipefexesefesa.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b65ae68ab7a---dixewowojat.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/78380318419.pdfIn PDF document text
    • https://viticoltura-enologia.com/file/loxogi.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d3be89185ce3839b353858e38fd3d038/refobakofox.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088b1924cc56---4259390383.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05bec3b83---putukigonepozebofosifol.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/51765884398.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/59683140475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=are+rosy+cheeks+a+sign+of+laborPDF 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_off0000e7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C5 16552 bytes
SHA-256: 0c116f5739378232f0a379fc2fe8b1bcba177bffe6202914cc7d8d6ac8ade138
font_01_sfnt_off0001123e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A55 10844 bytes
SHA-256: eb71e9d869c2b235d74a309f722744961f235e20f82febf821906169836c8ce3

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