Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8a182075d1b642…

MALICIOUS

PDF

115.7 KB Created: 2021-06-29 00:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6ec2f3c641d2eb24d3d3561d4702bc0a SHA-1: 1db1ba45b96f4d511f5b0e80bf1dc9d9385677cc SHA-256: 3d8a182075d1b6428e85ddd0f880e60fd9bf8f4ff79e12adbd8e831573284ea4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating a link farm designed to host and distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript further supports the potential for malicious execution within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55084e3c81.pdf In PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079573dc3e4b---barudobefe.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/35ac61c06753acef2a153689cf1d27f3/70936795022.pdfIn PDF document text
    • http://zcapitalcrm.com/app/webroot/uploads/files/jasepidaliwagex.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/3n6rb6g6243m5hikh9o1f5eokk/31280756390.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/seburuw.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6cdbb059af---timaba.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///bedijosapusewerinumifo.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/zigelanojexulapu.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/e5a57fc321bbe58107a5d3465d11bb1b/wuxebe.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c6feeccac---peden.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/65700987753.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/56369336008.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/db60d5cc96c4749383e969750fd5abe9/78619937518.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766df0d6476---26298526410.pdfIn PDF document text
    • http://yuha.be/_files/file/raxerimubep.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/eadc8l9b8v6q73q043culaceg4/bawisufaw.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac89ff35bf6---87292345135.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786589d7400---66798436701.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/zawekevinefex.pdfIn PDF document text
    • https://limsurempat.com/contents//files/jasigobakivilutazesunava.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/faxut.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/roxexugevekevedomajib.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/13017467425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+take+notes+while+reading+a+bookPDF link annotation
    • 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_off0001605f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1605F 10836 bytes
SHA-256: a254b5861f2fe660160f2d8a7516bf609b4d92d38f2c28bdce2ffdae330c245a
font_01_sfnt_off00017920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17920 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19132 17956 bytes
SHA-256: dc496f9646de1f41fb4d31f7d731e3d557661a5a172d0cec0e482e2f3d1f2dae