Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad57d01a0c2146d…

MALICIOUS

PDF

85.9 KB Created: 2021-06-30 13:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: cd1a0a2b3e1a4298869db91cc310b751 SHA-1: 838f992559b58d15cc9e49c450b5e651f9bdab3c SHA-256: 5ad57d01a0c2146da9a07f801812bd4b125a977d345eb47702dafae65dd6285a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a ClamAV signature and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160897fa814fe3---23281201801.pdf In PDF document text
    • http://simonhoirup.dk/userfiles/file/zafefaxuxupak.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/9d4ee0e6958216813bf2fedeb8f48853/43442552572.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/labanexuloluvekudoxisun.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729f9c80444---20439940945.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609981ed61bd2---40269213160.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0b6acecda---58130030758.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/47100362987.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e9b74f0630e33add586b377a5ee174d5/zomugasojobar.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/zeluteje.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/zafurapulajotokuk.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/losavedetofomefa.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/9b4df42faf1d686836cf9026a6e3478b/jipukabimudan.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/585d1199608b01e429374ca1832637b0/59319129409.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/vijupekodapepadepopol.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28666692947.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/rikera.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/ninalaxiwa.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/76412982969.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac94894a746---kibubitazusoreb.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/96660329682.pdfIn PDF document text
    • https://banghenails.com/upload/file/51218028948.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dba78cd45---15710247968.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9106c17f5a---pakis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+land+of+stories+book+2+pdf+freePDF 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_off0000ee38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 16768 bytes
SHA-256: 56a6efa55f7a6ea84d10257b59ea0eaf7115c9641ec46fffff786abe26e9b134
font_01_sfnt_off000119e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FB 10908 bytes
SHA-256: 5924b49cd09cad2814e011c527509e1c5abcaa1f7b98192c1fbe3ccebd4d5276

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