Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5339cd93faa2d94…

MALICIOUS

PDF

80.4 KB Created: 2021-08-08 05:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b1be8996e3b0bb47fab382ef6b39e4ae SHA-1: 1d374a6aae8a9727575f49d6172e499c7ae50454 SHA-256: f5339cd93faa2d94e848c8dfa0ec71e189384d4a1014762474f53afff767989c
154 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised CMS upload directories, a common tactic for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8488

Heuristics 5

  • 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
  • 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://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160886c039f95a---mubesafed.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a135c51986---gujebokoxezumefuxubapar.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089f7c01f5df---xixaneferazawazut.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/zedabafo.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/73748157863.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/8e269f5fe624d0a37342d32da51b9fa7/68481903982.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/77237626103.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/sewilemoriwerora.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723f6174d92---79445726150.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e09fbefbb3---84915948619.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ace3f15a5a2---siforapunoxapujugodiju.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/66916615ee3578990d4ddaaa7356440a/risavusa.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c49c946526f---3814880303.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/6b4fa403e65ab57c91735ab2b2788791/gomojawedutarag.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/85375947438.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d81a45cab3c28564208beca25167a9c8/59540090181.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ba0cec43b1096696feeb5997ae10a597/wosasafijomefijegikoz.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/36480556645.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/21032486842.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/54939315952.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/sijiligibo.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c511f74b5f6---libetopam.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/a84fef290b0388b2d7f57212fa83c8ce/69308049944.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b14c4569e9---80429215693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=flower+girl+dresses+sparkle+tullePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 10716 bytes
SHA-256: a9c998b16fd64c78a3f1ed9a4317c7b40670a22522479be527b92d3a37741ba7
font_01_sfnt_off00010db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1