Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f0bdcaa3327ad7d…

MALICIOUS

PDF

88.8 KB Created: 2021-06-28 13:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1824b0c277ca7c373e203f094fe654f5 SHA-1: 0e130e68d109852e6181ac38ee4cd98c8efddcc8 SHA-256: 1f0bdcaa3327ad7df459b61cbc9a704e9773629a2e6c56548d18c0bac8fba3a6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. The primary purpose appears to be directing users to external, potentially malicious content, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n8n4kvdb99c8rviof86c0djds2/kimenovexewojesebuzeje.pdf
    • http://cherryontop.pl/upload/fotki/file/korixebitaka.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/62205872660ac6efa1fefd.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b4dd17538---nimeruvabufokum.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ttd1vsc3f4l5n91lh5d770dg77/besurijifo.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083864d2cb14---pemipozajividuxolaj.pdf
    • http://caopump.com/admin/userfiles/file/daxolig.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fe2e2826---2266471732.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2380d7486---10691524897.pdf
    • http://kmkonsult.cz/userfiles/file/jobixuditosevexa.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609260ffe4bb5---wuzijonevafuparovonogosek.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/a575aec01bac4ba827067de5d987f660/55026414018.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a5e215a05---vemilegebiberemafiburub.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/967d273e2ee040c0cd615dd48de510eb/17510184703.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/20fb8f0c4449905c7629a37451ff347c/rikiriduvozoferawamepo.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf8be3a93---zuruzasa.pdf
    • http://abwlanham.com/uploads/files/48119135271.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2548c835f---4804020712.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/rmkm84ja5f8cd22bt0iv8tskh3/47567689491.pdf
    • http://antansconstructions.com/ckfinder/userfiles/files/teturuna.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939feb3e9f9---goviguf.pdf
    • https://puppometalli.eu/file/kazuvorefu.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ed33d0b36---momefipeguxanizufu.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/3648529a24a8b30274002635dcab6822/68296296688.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf57d38028---magakusigagiketeg.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=dry+and+burning+vagina
    • 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_off0000fb28.bin
ad7a5d3d7b954776147cce843a508e22e104b35d9b402c64f7778af474251309		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB28 10280 bytes
font_01_sfnt_off00011220.bin
0824a37c0aec82c68bf2e64782b5defecae8aa149daf2213ea03b5596cda090d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11220 16884 bytes
font_02_sfnt_off00013dbc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBC 16792 bytes

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