Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2ea20ad663a8384…

MALICIOUS

PDF

71.6 KB Created: 2021-09-18 23:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 90be3e2f746236e0ab20612a72b7e2dd SHA-1: c703c61c162055aa73198ffa0bf313f45a6c37d5 SHA-256: e2ea20ad663a8384e79910b59e064cb16f2569390ca6d787e1d1952d9d83fa8d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=idioms+and+phrasal+verbs+intermediate+pdf PDF link annotation
    • https://shatalarab-llc.net/userfiles/files/rapanojototutikozuwasajev.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/pomojituto.pdfIn PDF document text
    • http://geodez.com/pliki/file/36119200071.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/70900449413.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/8842869466.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/kamodavonijide.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/wakibuvamupumazodinagi.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/88127621472.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/togizelutolarotop.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/92162092578.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/jozopolafuz.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7978eb4f5---mekituwirefiji.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/28838947575.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/6e015857f5fc93e26991d2f01bd2e552/73663132322.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/33988651745.pdfIn PDF document text
    • http://juncheng.tw/upload/files/21943235648.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/89804707270.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/21434611207.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/rowibekopamovadefagad.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/38178991627.pdfIn PDF document text
    • http://clickvay.com/upload/files/dojigewininoropipawiwuxo.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16136bc3789ee8---ketanogomugif.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/97345143007.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_off0000b42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42C 17144 bytes
SHA-256: 4cee4d85e12d3a763c5cf9e86bf27bb89b6381004a91a70b3018acb1c81baf6e
font_01_sfnt_off0000e012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE012 10920 bytes
SHA-256: 409ce828725f3a67776d82ab7268d336d18f00d52fb58368ecaeec2d94290cbd
font_02_sfnt_off0000f8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1