Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5285e8a33dc0ac…

MALICIOUS

PDF

90.1 KB Created: 2021-07-31 16:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d0de1e1cebd9e1a5899edf9e0a40e41 SHA-1: 1d0a93549ff1c49f9adbeb376b6df8d5ea02198b SHA-256: 9c5285e8a33dc0ac53c3ea4ae60d824f7c73df44822a96b7ec6f6b2fe5b7fde8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites, likely under the guise of providing information related to 'rubik's cube tricks'.

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://crysiq.ru/uplcv?utm_term=rubik%27s+cube+tricks+3x3+pdf+in+hindi
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/a163a923779efc531d55d864eeec64c3/xalowoturedikefumozosipov.pdf
    • http://cwesp.biz/upload/file/24299753455.pdf
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/woxifajipamobekexafimivab.pdf
    • http://terezmisszio.eu/files/file/77300145775.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/rcci2tnss6hln0j9r3fkcb0ek7/79153744798.pdf
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/koramonibotuwoteju.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092abcda82f7---9410814644.pdf
    • http://fatamorgana.fr/uploads/assets/file/91821669971.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/b0t3fjm4t1fqpc66b71brefsfs/1618982929.pdf
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/topoposenegi.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/8f7b8e3a5bebbcb01e6cc00338305436/dosinobaxigerojujizavede.pdf
    • http://career-id.org/ckfinder/userfiles/files/18108506859.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b38477594b7---kaniw.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/90305023534.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ohbeapk0pis0k6aqvis6d0tb48/lagixabe.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c07df31da---jifodikaxebodezogu.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d77f2235a---83146584814.pdf
    • http://londonjip.com/userData/board/file/sirun.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160700a81b255b---namuwizasokumimulu.pdf
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/27429381576.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/a488856cba5fa6432489e10fae1b72e2/nosiwafenaropurudajawu.pdf
    • http://aybar-gallery.com/userfiles/files/xapozefikikivok.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f021fc66762---63161824346.pdf
    • 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_off0000faf6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF6 16792 bytes
font_01_sfnt_off00011308.bin
3409a6b4c93ed827d0bf85e70396d89ecb886ecb57db3818ca2dd59b47fb4a5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11308 17296 bytes
font_02_sfnt_off00013fc5.bin
1b434b180c5b463d91542983d8fcdaa49fb43aab0d50e3d7c344c957138b955c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC5 11076 bytes