Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5086c8937d3d35f…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 01:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0af0f941ecf803c58109127c46f40601 SHA-1: ead5ad6055008a76e3f38c876a572a8f62db2d31 SHA-256: e5086c8937d3d35f9e82991d105792a45714efbb3af7d6c06262f9a35727a061
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS uploads or disposable hosting. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=how+to+win+friends+book+pdf PDF link annotation
    • http://cupta.org/userfiles/files/20210901080229.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/78213181195.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/47660602699.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/v8lj6tr4lljus7qer7h0i8o2t8/labuvezoxitekojelek.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/41014734762.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/22811286440.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219221616272787.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/6334775194.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/34068602546.pdfIn PDF document text
    • https://centrehistoriquesndbc.com/ckfinder/userfiles/files/pexedizex.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/vabadasiwizun.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/vifenifusiruruloraxisebas.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/40078316897.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/pizozazuwuzonilekibiw.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/pegikaxukizefupuv.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/tukaxegubujefojijozeji.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/73403201930.pdfIn PDF document text
    • http://kotolantopeni.cz/file/bigevopodiwowazi.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/k18i27utdda97ptluksqinv3o3/95770766671.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jasoxoj.pdfIn PDF document text
    • http://yjccnc.com/upload/files/kokikonetebupumuburu.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/b50f8caa261a757cd829fb667a3a48d5/17318379935.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0a96c3d90---85876258165.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/kojipijok.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/sowomoju.pdfIn PDF document text
    • 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_off0000b27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8F 16280 bytes
SHA-256: 988cde604b59841501033c2d1a3a3383ae5cea0344c5dc954a93e2c55d0ce436
font_02_sfnt_off0000f330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 10592 bytes
SHA-256: e9765202d4bb9f543d7e737dc93e61c929441ca13d89f4d00bc28f71ef0481b7

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