Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95854a013262298…

MALICIOUS

PDF

83.8 KB Created: 2021-09-21 07:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3f1f37de7ceee5f7011c372c22a4ac4d SHA-1: 13d16143d3f88d977e48632a1f353176d8cd40b9 SHA-256: e95854a013262298178ed8d0b356feab193eb20765514a30675424b1ba91518b
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy to create a link farm, likely for SEO poisoning or to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=sexy+sunny+leone+bikini PDF link annotation
    • https://inmaabiladi.com/userfiles/files/tefefozetuzik.pdfIn PDF document text
    • http://www.toptehnik.si/images/lamulinevelijovakupen.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/67850910563.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/hrs7ldg4i00nfllgb7uq5mm6jh/kekasurakabojozomu.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109190705304880.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/80099256247.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/89533971717.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/suzufukitofoga.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/zovenufomaxopawowap.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/gewozulomiwodukafo.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/sogagefugap.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/40884469871.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/newunepevopowidudux.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/fbe4363e7e542beb985de0f4e7d57ea2/80263991912.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/wagofavurazi.pdfIn PDF document text
    • http://showpelec.com/data/file/20210919_194859_936.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/gozelubemadolod.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/votiziwuvejij.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26569969337.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/zixajaniraxajosad.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/58551534757.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/65771972937.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/29374420287.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614099b2858cb---jirus.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/85087203311.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_off0000e2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 10364 bytes
SHA-256: 071624f098639e9c505289dd9916bb0f8d3256d9954494e9d3e899ad4ecec39c
font_01_sfnt_off0000fa71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11283 18080 bytes
SHA-256: 6b352f23e3e9627e9c64d891db59b351c87a0ec362bf07b8c159b61c35816e1b