Malicious PDF — malware analysis report

Static analysis result for SHA-256 04e8044a9550c6f0…

MALICIOUS

PDF

67.9 KB Created: 2021-09-16 11:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d9d8c63c2c839595b628299fd21f18c1 SHA-1: 479b1bbaf275289ffcd96c6acb436b536293141f SHA-256: 04e8044a9550c6f04ed634aebbe7dc9d3e27585504472912f0f2309e474a28af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links on disposable or compromised domains, designed to redirect users to potentially harmful content. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm suggest an intent to facilitate malicious redirects, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • 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://vagtteam.com/userfiles/Files/labalitalujirasodagivote.pdf In PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/84995076087.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nivatujuxuwenefebosiwovo.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/15726762559.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/3477688344.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/pisetugamiduneresilano.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/33242806196.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/16875226384.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6132AFF789BA3.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161312aa97c8b6---zepuruzebenabitugibada.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/gemarililekabobabaxe.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/22329476214.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e6b956ab446514c7f6a4bc3c21bc9534/pexiku.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/68962938642.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/pubuzikugogize.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/veboru.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131774cce985---64179978397.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/d0718b9168df78f98c7172501f2b1f96/soliduvaf.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/88450536417.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/13312523028.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/1408598738.pdfIn PDF document text
    • https://gornjastubica.hr/files/dusidiwola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=moto+x+cool+math+gamesPDF link annotation
    • 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_off0000adab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADAB 14644 bytes
SHA-256: 1170ec137070d8e317d320c52694d6995b02f9568cdfd89a9865a98b7d1b7b6d
font_01_sfnt_off0000d299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD299 10476 bytes
SHA-256: 008be536d23fff3fcad88523174e63a346ed50e81c1448eab576b03bafe29303
font_02_sfnt_off0000ea89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1