Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59495acbaf55bfc…

MALICIOUS

PDF

90.9 KB Created: 2021-06-28 09:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b11524aebea3753319b07ff003d955d1 SHA-1: 9b53b8cbd69f2598acacca2fe3c01e68d3a90f10 SHA-256: e59495acbaf55bfca13416f5776c6d85ddf71dd009663290b965e942e22e8a86
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or further stages of an attack. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://webinaris.training/ckfinder/userfiles/publics/files/16961403314.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6878406672---10405257264.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084df764d2a8---gejizo.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/856da572542ca0a14f8b047fc443543a/worojax.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/9ijal3s0n9rsk7t4977dndiqj3/rexuwusekegumaziwulikos.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095b0ba770f7---duvaxawe.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091ba4358383---30224544438.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbfc8c49d8---95686959038.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608c82bca3bcc---66130416735.pdfIn PDF document text
    • http://adveotec.com/img/file/bamerexekega.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/28674986834.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/33738429820.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/d25cd4895bb018a15ee03f794c6d1bcc/lerugolizisefu.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/57419009623.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/dugan.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071ce28449bd---69831993958.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/8574933fd34e9bbbb4e24383cbcc4d95/wemexabojexofurodamazobij.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ae4c73d60---lisojibipogikuroxemo.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/32825644766.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/24395762492.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/9f7f84db458dffa077a1aaf072296738/zegar.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733d585e8d4---tidulewevuxepetuxun.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089c29fc0297---66201894054.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/09ehd0gd8um3o6l2tlqb2mptmn/redimupalewuvadamotafosof.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/04941b68e6982a4d0d79190c970643e8/rojevob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+do+you+unblock+numbers+on+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE858 17268 bytes
SHA-256: c7c24a25153dcaa7ee9cb82b512ee8e341257a2d465927a4ce1bffa51e521d39
font_01_sfnt_off0001157a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157A 10956 bytes
SHA-256: 0d03adb997f1607d5d5442519ba86b25986e773fc67fbbd0ea4f4bf74e994232
font_02_sfnt_off00012ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED6 16088 bytes
SHA-256: 0e3d63f173342003c62a86c726d4d5a85e7f52d44cf06618766a4fa08a0866bf
font_03_sfnt_off00014409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1