Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d66667ecf7b181…

MALICIOUS

PDF

88.4 KB Created: 2021-08-03 12:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6cc3c133ba22a02b624d8015b1e10a97 SHA-1: 1f3959208c9ab22a75370c15a0fc295af2242848 SHA-256: 38d66667ecf7b181da1abe703450d7a5d6cc1283ea9e062aadca883f1bb079ea
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://clean-ecology.com/Upload/files/vigibibipolu.pdf In PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/xogesixabufinuxeroluwuj.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a0031acc3769e307b2ead58accc813c2/sofetidetexidubixewat.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ee6arj7k0dif0thb8go8imeca3/28679930503.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/35347544642.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/wupirutesezovodef.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/c55059a39986cee603c41fada48951f8/57575607107.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/reluduganimudule.pdfIn PDF document text
    • https://mfdesign.hu/files/file/fupavupes.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928756dab4f---67110444582.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/xozijopel.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/leqf11da7ngnf0lnki59l3hh62/dafapirakofodi.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ea2419dc69016938d0b4e4b046c3b647/neraxela.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/nd78pjnrbtk722ovobts3blp44/46076289174.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/xopigofezinut.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ce377583d23f8224b60419085d21fa7e/73727041004.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/74051623738.pdfIn PDF document text
    • https://panama4d.com/contents//files/98191525208.pdfIn PDF document text
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/talirorigotigixeva.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/76513981399.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dd277d1c6---5981741580.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/rofukezosov.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/def2815b9d8775d46aabe62d658df960/5597891116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=modern+business+organisation+and+management+tn+chhabra+pdfPDF 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_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D25 17056 bytes
SHA-256: 80f4711f97a0d69dec49d61dac9cfbd24e99281309c2add313e698bd17b6df6d
font_02_sfnt_off0001389a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389A 11256 bytes
SHA-256: d470a9e73f429ba16f428689a5131e30108d36ab509a082e55c5def56606b37c