Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1cc8405176d124…

MALICIOUS

PDF

77.5 KB Created: 2021-06-19 20:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 028d0fc703ef91824f094937f08bc3a8 SHA-1: 61330e7bb45773ba8d43768e054fd4e2e2038711 SHA-256: 1d1cc8405176d1246de84f9310e1d50d574aa252d74fe72a6990afed7e9ac9fc
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress upload directories, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and contains metadata related to its creation, but the primary malicious functionality is derived from the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/vowis.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e97bdb21e---68609716329.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2f7546b5d---kofugilez.pdf
    • http://hifimarkt.org/kunden/kronhardt/ckfinder/userfiles/files/37913845512.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096617b1f411---gekufedugipovox.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088187ad79eb---39359295087.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609895044fbe0---jumatimomovu.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ibr2gu5k3g5t1dvttn189bhhrl/12952587965.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8c8e74c34---58951105715.pdf
    • http://merrygoldholidays.com/ckfinder/userfiles/files/kidodapul.pdf
    • http://e-hane.com/files/92994246112.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/nhmhqjj8e7enibjne02ntpfd38/zaxokisexunevegakijiw.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/l2b4a44anrthqog1d982o2togu/sidolifuxibigaj.pdf
    • http://kppzp.pl/userfiles/file/49339847494.pdf
    • https://catbasailing.com/upload/fck/file/vasafavexowiwa.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160719f414dc68---56641888765.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=wow+classic+hunter+leveling+guide+talents
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f22d.bin
59148313ffe3f3a4ad4321c5c6ed61a21d1173541284e9d70ce9e2c4ee5e57fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF22D 5368 bytes
font_01_sfnt_off00010485.bin
ac735af8fa80f766348b096e66d86c0ef4caef3e585d4d87a0916773206c59cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10485 10712 bytes

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