Malicious PDF — malware analysis report

Static analysis result for SHA-256 14425006219eb91d…

MALICIOUS

PDF

74.0 KB Created: 2021-09-03 03:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 161a4c26858a64402c7544d2dd4b6e7c SHA-1: 279bda51f1710d4136161cf2ede26630a87147b9 SHA-256: 14425006219eb91d622c0c1a61f41fdf5f99372da2893df583aa5268d9cd346b
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to external malicious content or potentially for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://arkystudio.eu/userfiles/files/betesizurugufa.pdf In PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/220999039.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/mokamuduxozizulofuru.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/57534086908.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/58054626682.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/ba0ef313d94f640445b9fa3ce2bb2727/60795672420.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/23317309633.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/08a73ac89e45cbc74e9608577a9d6b61/11148774293.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/3593832097.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/sufapiveganidurulameka.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/dca2d8c808184eb65d4f73dba442c46c/monisabimupudebobido.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/dc288ade3e676b1f581f5a14cb4c6f40/9847356601.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a7919b626ab682e592a12dbbd1bf565d/48994311269.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d1a1eac5---55281092021.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/76911032239.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608052b2489d0---bapepizibotefutupu.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/27863629268.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/difexuv.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a519162b626---18808962038.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/8918683879.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/papamuzapikamefatub.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/74908697759.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/88000037564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=calendario+2018+pdf+con+festivos+colombiaPDF 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_off0000b99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99E 11520 bytes
SHA-256: 078d85408a34a1f21d356fa4308d4fba7c44a3d7ee0d6835bd9fdb02d18120db
font_01_sfnt_off0000d4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CA 17944 bytes
SHA-256: 915ad6338831302ed1e98ed551382c102f4fa685a86c37e7df5d5cc12e59ae4f
font_02_sfnt_off0001023e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1