Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3da42d0c5f8d4a…

MALICIOUS

PDF

85.8 KB Created: 2021-07-14 09:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f04437ee26d3b5f161a43867aa86ee5 SHA-1: 697069ec5b139b16ec38340f723a0a2d08e9d143 SHA-256: 6a3da42d0c5f8d4a2d3bb5ce4e9c99b6b7ae46247f12874b77a5b781d275a5c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=braun+differential+equations+and+their+applications PDF link annotation
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a27d43b86d4---wojefepetibaxaguju.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b21b13697f---setefazawaxike.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/60105162384.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ffob03t7hsfbvhhpq8a5ofl765/21201284187.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607744a1c1e35---wurezulef.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/96709505834.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/kfsmttkuf5fu861ut3op3dlvpn/velobaresefijozigo.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/88785674718.pdfIn PDF document text
    • http://ort168.com/upload//ckeditor/files/lanuvuwisenugugudolaxag.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2b4811dc61b0bd4eeda42a8e3a501d8e/xigow.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/7dfd44c776c05acc23c024b7d297fbed/dopurewibowadewudituku.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607add3490b5f---77547194685.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/51f1e015632f9bcd973a6526028244a1/98274065920.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/mutofagodivosus.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/wazivulufireramogom.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/jbrqsloqvm0r0v35i68kp9ictt/didatesefuluzo.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5380b4bda---38438306349.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/lotirefekasuvunebavegadin.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071986697037---wowodowizilafikekenolujug.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8273b63e50---najotoganugujuz.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/siwurukurugarilolujet.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/wetomotaxafe.pdfIn PDF document text
    • 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_off0000e036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84D 11016 bytes
SHA-256: 361cb251fc27a4fcaeba9d9325ad844f6c2fe18b0e29831c036884fe836312ab
font_02_sfnt_off0001119d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119D 17160 bytes
SHA-256: 8df37b7881cf0b8ffebd2ff642afc062b922292f38a939e19f23da891644f695
font_03_sfnt_off00013eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAE 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8

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