Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3ec7e3605d64f4…

MALICIOUS

PDF

108.1 KB Created: 2021-07-14 05:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d45da9796fea853b18237a739846c06 SHA-1: eac850f18b8488b6f89189765fa1af1849cd7994 SHA-256: 5f3ec7e3605d64f47c35de9179c00dea6adb0f1897bdb0d2ca81f521f98b1e61
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://dungcubepgiangtrinh.com/webroot/img/files/zaweb.pdf
    • http://jrpst.pl/userfiles/file/ranepajazidujiwil.pdf
    • http://ingenermarket.ru/userfiles/25124038241.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/74b5ac295072ff37c07fc34a2d5307f2/nesozakumu.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c06aba1a3---muperorezadogoj.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098ca1b60e88---sopirojeguw.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/mhnjos754h2odsfc1f7q3kt9d2/97098603391.pdf
    • https://eastmanllc.net/ckfinder/userfiles/files/jalixowugegosotu.pdf
    • https://twr1115.net/files/fckeditor/file/lipidawuvaviwebogul.pdf
    • https://chornakorn-packing.com/ckfinder/userfiles/files/22717046353.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d2134fcbe---8481656858.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071df42bfae8---sixumevupobonir.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607313080238c---86385432991.pdf
    • http://dekoblickfang.de/userfiles/file/kilavajanojetux.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c7132d826---kudanosutuporadisalabab.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/69406096522.pdf
    • http://lowndes85.com/clients/d/d3/d39312ffd46aa2fbcc4e4de04d96a17f/File/xesesexolewibizewuxo.pdf
    • http://webdulich.com/js/ckfinder/userfiles/files/zovuxitirevas.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e62d515b5---98830947682.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e56cfc35b7b41009b4bcd5a72a2363a8/mezitofetadobir.pdf
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/rubstsg5fbo43elcuvprfudq3q/30610864874.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9e87e9c92---xudugulas.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/e20c56a6d9db159e28ae94dd672e969e/85831717859.pdf
    • http://alpha-cp.com/userfiles/file/43157701129.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what+could+cause+an+enlarged+spleen
    • https://medlineplus.gov/spleendiseases.html
    • 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_off00014463.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14463 16792 bytes
font_01_sfnt_off00015c75.bin
f9fd3d512bfab9a79af14ad5119e353b115c5377351d8059bea9cac9631b4c45
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C75 17460 bytes
font_02_sfnt_off00018a56.bin
bb68426347ae5abaaa754524241f91284c6050f34dcb44b03c0248845bb6fd32
pdf-font-stream PDF embedded font (sfnt) at offset 0x18A56 10792 bytes