Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e203920dc71ac8…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 19:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a3b7cea5830b00c322db1b3b110b3e31 SHA-1: 026a90e2326e8b712bb075979c70082639081c15 SHA-256: c5e203920dc71ac830710e8c35609a837a5045a0463c95c1a9da7d4c75b35ab2
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gallery4walls.com/upload/editer/file/jatipunuzu.pdf In PDF document text
    • http://siripanyalamphun.com/user_img/files/buzar.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/robixux.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/26725681484.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/saboziwifevubuw.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/21786371746.pdfIn PDF document text
    • http://amandamaitland.com/images/file/pigige.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/lowatumagikori.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/kawuwuna.pdfIn PDF document text
    • https://telenovella-bg.com/files/pasotitopunupekiz.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/95572951463.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/81431638118.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/xizuravojuz.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/a21b75c68a378e131f9206cfa8f0137f/fowujotuzelubomajix.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/jekixolitawirufokebup.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/kulegu.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160712604e3e59---pofebikonotago.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/gulabe.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/33e7e67b75b51aca569d39108ac91538/bapinilok.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/3e9a275d79e28fff301313a619fce79e/xapitoseripiserarabuwulad.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/76660060196.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/kafalemixelexinaluriwiwun.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/dedijidufotuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=numerical+methods+multiple+choice+questions+with+answers+pdfPDF 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_off0000d7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FF 11192 bytes
SHA-256: d93c2ee4f9ec9db933b2b6b93f4d0863243e06bb934defc0220f345d6708719b
font_01_sfnt_off0000f1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 18204 bytes
SHA-256: d33b5dc1c18d75b63cfa7ab26c17c9bed78457d832e84d59c7d9bfe9e5157521