Malicious PDF — malware analysis report

Static analysis result for SHA-256 39bc8cc4f78a27bc…

MALICIOUS

PDF

74.5 KB Created: 2021-07-31 15:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 787ef74befed3d6e5a76c39e5883ef07 SHA-1: c9d99688c2d8d497686142993b8f61cc9b3a5e5d SHA-256: 39bc8cc4f78a27bcb2169377cdedcf155557b0d5b806a182f1329efa8111df00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely to host or redirect to malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/7pnc2c4siveaa6cubidismff5j/15769105663.pdf
    • http://turnyras.lt/Files/file/13298647435.pdf
    • http://furniture83.com/upload/files/diwefebafeku.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/94c0bd6ce94225734be9b73a99edd69a/35961036497.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/32b1c70c7eba60a87a81f6286e69a57b/wajibawuwobupidifek.pdf
    • http://sparkpro.lv/content/file/fevubego.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/vivajofuparinibi.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088ca6988573---jamexo.pdf
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/bedik.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f69fbd874---42040907658.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/01cc89157dcbc791f72b8ba21a3117dd/duvolupokexato.pdf
    • https://hse.tw/upload/file/3248633268.pdf
    • https://condominiovillage.com/userfiles/file/levib.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a70cc683a---7991067460.pdf
    • http://bomtvplus.com/data/board/file/20210621155606.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/c8880b1faa5d0aea8d73096b148b6d4f/22589520449.pdf
    • http://ed-web.cz/userfilesfile/mukofebejipufixogidakop.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7c69149b9---24817709671.pdf
    • https://epiphanych.com/images/file/vozezodol.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16071e23f5fad4---bigoxetegixazige.pdf
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/jarobodulafuvakun.pdf
    • https://ludifrance.fr/userfiles/file/tukuzovumavawopuvafure.pdf
    • https://a2designbg.com/userfiles/file/4384261706.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/5492d44d96636bc2633b0e1bc06b4910/mirukotuxudadokew.pdf
    • http://bulongvungtau.com/media/ftp/file/37218125552.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=glencoe+algebra+1+chapter+6+mid-chapter+quiz+answer+key
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcf2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF2 16792 bytes
font_01_sfnt_off0000d509.bin
366e830ff48da6f9557a87cb09fea556615c1ee2d5eeb0985e0d06219244b2e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD509 11992 bytes
font_02_sfnt_off0000f12b.bin
694c41b2e9c72245f4880567c6e33ea414a2fb567fc5b65b0264c6a665e844cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 16308 bytes