Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19c33d2fa16bd5f…

MALICIOUS

PDF

114.5 KB Created: 2021-07-13 20:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a339a0de922db1eb37e6a7f89d8c3c82 SHA-1: c89950026e4e01e64510ffa4a694de66cfc36e06 SHA-256: a19c33d2fa16bd5faebca104b40adbc4911375c9127b67c89a2a47edc7492502
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF contains embedded JavaScript and a high number of external links, many hosted on compromised CMS upload directories, indicating a phishing or malware distribution attempt. The presence of a 'download button' lure further supports this, suggesting the document aims to trick users into downloading a malicious payload. The ClamAV detection confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9627

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=adding+and+subtracting+fractions+common+core+worksheet
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6836f4fa0e---mazowojakepise.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c67bdfdfe83---pegumopab.pdf
    • https://towa-aaa.jp/userfiles/file/20744873295.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a30ad8a42ef---67579297945.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed9a81729a---diwuwufalufuwewili.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16087d23a9da03---mesesewomoxijepidital.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf9b7e9d6d---dulevajeluzitobufodano.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8e9e71172---vedokibupidatomuputejoki.pdf
    • http://firstcuwire.com/file_media/file_image/file/vipunobupodibif.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa232a372d---rapodo.pdf
    • http://billsky.ee/files/file/61210287554.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9af7942157c6b97ebef518ec951ae6ea/degosakuto.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/862acdc3fee6afc911ef1f39a0832410/50436893716.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/rk13vkk93gsq3cpn9svr6le70h/rasijopaxamedogelu.pdf
    • http://muzeumostrowiec.pl/obrazy/file/liziwusip.pdf
    • http://zuche0551.com/upload/file/poniwunixawapumaxujevet.pdf
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/xotubudexakazojedi.pdf
    • https://lawrenceyezersky.com/userfiles/file/geguritud.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a59f38788ed---99837367604.pdf
    • http://finalstage.biz/js/upload/files/tajifojozukad.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f02a3b849---towawugera.pdf
    • http://tareeapartment.com/user_img/files/4074135713.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a59cbadc534---pilikazusozomiwa.pdf
    • http://shopexpert.com/app/webroot/files/userfiles/files/jazawaragev.pdf
    • http://vivalepurrexotics.com/clients/2/2f/2f65fe2011b8f0b07f64c29a74835a02/File/dotamejixowu.pdf
    • http://yejida.com/userfiles/file/lafat.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014743.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14743 16792 bytes
font_01_sfnt_off00015f5a.bin
e1e41323d79cdfca4d27f277752229cb193071d49939401da3304b1d504944fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F5A 11276 bytes
font_02_sfnt_off0001798e.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1798E 16092 bytes
font_03_sfnt_off00018ecf.bin
a6974a903b411cf188c06792fa988688f305443f9293c2b680443f29e5f68840		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18ECF 16952 bytes

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