Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef6bb38a536b111…

MALICIOUS

PDF

75.3 KB Created: 2021-09-28 15:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b24be4bd84dbcfea1836c2b6d80bb5e9 SHA-1: d0ce48751f46f1bc379d366161eb37fb0cd869a3 SHA-256: eef6bb38a536b111f7e346aa97cc1033471fb2002e3942710135aa09b27765f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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://medvor.ru/uplcv?utm_term=super+mario+forever+flash
    • http://air-con.ru/upload/files/68438958638.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4ca6194b5---fekedevizenasakok.pdf
    • https://norservis.info/files/files/lumut.pdf
    • http://elvirajogsi.hu/ckfinder/userfiles/files/43425654650.pdf
    • https://www.alitec.es/js/ckfinder/userfiles/files/xuxuborozenunezivigazowup.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/4bg99fee35atdsmehgnhaiv9n5/resuwuzo.pdf
    • http://abbuffalowings.com/uploads/files/munozafiregakub.pdf
    • http://bwemfjhjk.friend-match.com/upload/files/bofoloxoxidalosisigilo.pdf
    • http://www.centralperdana.com/file/tizebelavuridun.pdf
    • http://arniuniversity.in/ci/userfiles/files/xobiz.pdf
    • http://kalikraft.com/images/file/puviv.pdf
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/nameseledefetit.pdf
    • https://cafesca.info/ckfinder/userfiles/files/kodarutagutelezulalozexi.pdf
    • https://hobbes-group.com/upload/files/91208843326.pdf
    • http://elisa5888.com/shopadmin/upload/files/midokusep.pdf
    • https://network-italia.it/file/98512434132.pdf
    • http://iwilldoit.ru/uploads/files/files/81696408566.pdf
    • https://christianschoch.ch/userfiles/file/rujuzoraburojumedo.pdf
    • https://www.karelo.com/uploads/File/wemeremanot.pdf
    • http://cesurmakina.com/userfiles/file/rivagesexikejegutujibuxik.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161318bfb24837---22029688071.pdf
    • 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_off0000bc46.bin
b611dab146d2567eaeb55b9e2dff41126cc5136583b5dc3b704f09c661940a34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC46 19232 bytes
font_01_sfnt_off0000ef32.bin
52cbba201b2b1d045456285312e928bf650b8d801b7f7f8a18d0622d80024bc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 10664 bytes
font_02_sfnt_off0001079a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1079A 16792 bytes

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