Malicious PDF — malware analysis report

Static analysis result for SHA-256 1595ef1421f5ba91…

MALICIOUS

PDF

84.3 KB Created: 2021-07-18 19:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ecf979744cabba1dae04d92041b5a147 SHA-1: 81f1fe572b8c2ec0484087ce4c00965f9e28151f SHA-256: 1595ef1421f5ba91b5a3db04bd4163ce9f713d4905d16cb86f5ecbb79f8254c3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload storage, indicating a link farm designed to host or redirect to malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9ca58b088---6415999631.pdf In PDF document text
    • http://agataklimowska.pl/userfiles/file/geguzuginukibuwad.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f8bad6808---33022027960.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c05df273808---wuluzujemirakisutu.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/gipenimamobe.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/2773231905.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/minotefob.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a198916b4---tavujivi.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/69058736579.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/jamuzibigemasoto.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/vumonezi.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/fubanasago.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160911a991d91f---togatopukofo.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/1d1ce08798d280ae7a42ea1df315a9ea/81035563570.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609a23f80a0cf---tifamajovijiwodasibufi.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/nsp1bl0g1gjv3svmacra22ppo8/kifanunemok.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/paskc4sitfd4bcc4888qlespkr/totebusi.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/sedilugojorilifikitesogob.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/91358739895.pdfIn PDF document text
    • http://royalgroup.at/tmp/bexaruxezege.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021070511034890.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609050ef0ed8a---59690037048.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/cf74d3ad23543f94e24ac910d2cd3ee2/nexasenoroxadagunu.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/696ad983fd15264318d1fb6fdb15e2cb/bijobibevasuzosuzaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cortisol+and+menopausePDF 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_off0000e909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE909 16532 bytes
SHA-256: 122031563d7594b2aecdb83dab14057dd6af211890dc5be5b02bdddc7bcd6155
font_01_sfnt_off000113ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CA 10684 bytes
SHA-256: 5f6fb9d36ea02832f940f5e466553fa831947466130da15292e673749c97c20b
font_02_sfnt_off00012c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1