Malicious PDF — malware analysis report

Static analysis result for SHA-256 948846dc3c2c49de…

MALICIOUS

PDF

74.0 KB Created: 2021-09-05 05:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 81e2b412de368140a7ea5aab2a45bb73 SHA-1: ffbf93ebfa77b1c18b1b544d008407dbe28cb301 SHA-256: 948846dc3c2c49deb9c5b07b673d4e0bc4f0a864af36e56066fff3804776577a
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to exploit vulnerabilities or trick users into downloading further payloads. The presence of embedded JavaScript (T1059.007) suggests the PDF is designed to execute code, potentially leading to client execution (T1203).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://cructi.ru/uplcv?utm_term=insulina+cristalina+pdf PDF link annotation
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/76e7039c00e6a67e689ef1fda4316993/36663280011.pdfIn PDF document text
    • https://x-software.cz/data/file/pudojukemivululi.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16073cbb5e9ed2---boselobuzuroda.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/49104982707.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c6f8edf89---xuwojuxezotubazevafeduk.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d0383b95e---1469017966.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd858d9a06---bijirexexeve.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f401fa3e523---lopenekikofimol.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa83d0b846---56612939087.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/d5d6c43ad4f689610988998fd037f02f/kojuzedogasufese.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/61539555770.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/nofabefaxunitusez.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/tn519afhg8gjt9h6la9228rdc0/7751840548.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed63454967---kanarugadaxexodi.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/166967751.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/rekurutixosudalek.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b246ee4ca---20595597283.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/98873832202.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/maduvisitebofoja.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/e1f2ed02bafff3ed537539042c0b9bfe/basedap.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fe10ec0ae---9299953928.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b17aec420c---11225745009.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/93857479180.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/gatirore.pdfIn PDF document text
    • 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_off0000c08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08D 16652 bytes
SHA-256: a7ee365f1fff1d7adfcd65a82da86b08f4d1672f29d213b9c52ed18bc49d09cb
font_01_sfnt_off0000eb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10354 10412 bytes
SHA-256: 3e0e96409a3d4e822a40948085897aa54f7068e282b93628ae1c4de33de4a70f

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