Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec508c361dd0838b…

MALICIOUS

PDF

77.5 KB Created: 2021-09-13 00:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fabb393cd84d5cef24148b1d52037859 SHA-1: 4a15b45452e49d527b8a6297768254cbc924a9ff SHA-256: ec508c361dd0838b4e4e2c1903bf7baf3d3395d7d039f7e37f223a8d288382b5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous links pointing to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161388df53bc85---dipasubidiletizaturilosel.pdf
    • http://ourpreferred.com/userfiles/files/woxurova.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e70b7125ac---mojamapozosaworaza.pdf
    • https://hmradiatoriai.lt/images/files/73677220813.pdf
    • https://birutelorasin.com/contents/files/17530198273.pdf
    • http://reichspfarrer.sk/file/26585640623.pdf
    • https://marblo.ph/app/webroot/img/files/bolibo.pdf
    • http://oralrem.kz/ckfinder/userfiles/files/68493884930.pdf
    • http://smingames.com/ckfinder/files/67048675504.pdf
    • http://ettorebelfioreliutaio.it/userfiles/files/tovetobijilewijipizupiz.pdf
    • https://tedvandergulik.nl/userimages/file/58935288685.pdf
    • https://ecoledesgourmets.com/userfiles/file/bodijedapemuxe.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135cb1860f6c---35146759078.pdf
    • https://hoavily.com/uploads/files/batujupewevogetum.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ec2ac559---74410496781.pdf
    • http://zhouzhuank.com/v15/Upload/file/2021913519343752.pdf
    • http://bright-mineral.com/uploadfile/file/2021090320440488.pdf
    • http://uniondrygoods.com/fckeditor/userfiles/file/geluz.pdf
    • https://interstudy.net/userfiles/file/9925984004.pdf
    • https://taiwancy.com/app/webroot/userfiles/files/88197808768.pdf
    • http://paillasse.hu/userfiles/file/11928244788.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a92db60af200db754abd786e5fbc3bda/pexisofu.pdf
    • https://cpc-serbia.org/js/files/21521214707.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=vidmate+apk+2018+download
    • 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_off0000c825.bin
6be644f0395087aa629c1795afb4ed716e4594d9a99c83f13e8a426eb90a9537
pdf-font-stream PDF embedded font (sfnt) at offset 0xC825 10932 bytes
font_01_sfnt_off0000e18f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE18F 16792 bytes
font_02_sfnt_off0000f9a1.bin
cd33396ec6decc64426c34ec9f642432dae0af2c4715edd7c0f0db93471b3e10
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A1 18380 bytes