Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dcbbf0693688d31…

MALICIOUS

PDF

78.8 KB Created: 2021-09-07 04:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 252832a382220af3ce0954c3f90f486c SHA-1: 58020296587272d708f635292e7ebe8fd7d3534f SHA-256: 3dcbbf0693688d3165ebd874587d3d6ce6a468804755a4db07b40da015ea215b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, which are likely used for phishing or distributing further malware. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially engage in SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/f0b1d035c6be28d5d52a8479f9e8cf03/71637551963.pdf In PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/6f841152dc6e550ff7c0b0bb6c482d0b/71705072500.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/81760406926.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9be6663e1d---85566295093.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c93383c8035---lamupibanobugeluvuzoz.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/l2c046vkk5n1l3i0evq85pigga/xakekix.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/68470391814.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/cc670631cb5279750b99978e9ba36122/vafiralomawubenon.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/mapojegegebufibaburaj.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/47186707337.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/wixazawidib.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/61808409404.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f513217602---vidijagini.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/bozoxogogefana.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/30104429130.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/61747129650.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/1398820500.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/58810926816.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210716_A0074ADF2A4F2146.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/48657982198.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160858698e605f---62767655195.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/jatikatox.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/tonurewuxozemaloxefon.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/5d4fd418020c083cf485a3237e64e33d/kolet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=representing+numbers+in+different+ways+worksheetPDF 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_off0000c95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95E 11476 bytes
SHA-256: adbc55cb2d0053e17713bdab74ad7669f74c9a7b3520d884a988d663bf895bf6
font_01_sfnt_off0000e407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC19 19728 bytes
SHA-256: 9ffa3d36f65385214e84b058b3b8799b978c5d4c49806bafde47e59fa48268f5

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