Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c2e81040f53728…

MALICIOUS

PDF

70.8 KB Created: 2021-09-06 17:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dd506f6519945b1ec1e2a517c34fa213 SHA-1: 38443f839f94a19c80be4703a4f610999e1e22c3 SHA-256: a6c2e81040f537283acb457a73d61299c9dbbefc1f2e2a2a9b63377cdb464d0b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and link farm heuristics supports the classification as a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=fragments+and+run+on+sentences+worksheet+answers PDF link annotation
    • https://bloomeng.com/uploads/55159882650.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/er80ghmupa6rq7gqruq44cluv0/5929856214.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/lufilubog.pdfIn PDF document text
    • http://passionsavannah.com/clients/0/0a/0a61c075fa1d7d91f8ce2ef588f7e9ce/File/56977724519.pdfIn PDF document text
    • http://lse.hu/userfiles/file/derekuserifozejirimaxaru.pdfIn PDF document text
    • https://ibextrail.com/editor-images/14148181615.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/nilijodanutup.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/jisazubagaduxujez.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/litikirewanasi.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/d3d2059d3c557a89174292e38000c728/83878727230.pdfIn PDF document text
    • https://lazerom.pro/media/file/xikelujejepudilarasiwala.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/3560943346.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/zolunewip.pdfIn PDF document text
    • http://jp-cable.com/d/files/misaporumeniwi.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b271ee596d2---95058695128.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/limokuravakavarigasoriv.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1d7ca9e0a9a9154a3a662da8b63834b8/pegananetomet.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/71e61d4aa49da1884a8895a091cad477/vogogujifijox.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/38668389956.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610f1cfaba5d5---25753220005.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/6dea9cdbbfffb74f841e9d34029853fc/99389495612.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16071b19d1a94a---68027861765.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_off0000b43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43A 15944 bytes
SHA-256: 2d0bb2dbcc2f44a10ecf6176b9f3399ddc8f7976232542a8d3fd83fad9b48def
font_01_sfnt_off0000dc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AC 10936 bytes
SHA-256: 9cabe4c544d49d976e54d493145bf1127791f1601b7c3a935994c380bb459fad

Open this report in the interactive analyzer, or submit your own file for analysis.