Malicious PDF — malware analysis report

Static analysis result for SHA-256 568d12c8b22678c1…

MALICIOUS

PDF

89.6 KB Created: 2021-07-16 21:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8265cdb651f0d7b6ce6abc63bb1596f9 SHA-1: be82ec29f46d211de2dc993f1fbbb43afb760f1a SHA-256: 568d12c8b22678c1f6a4bb82a9177573e2c9c22e7cbc44d429a1c7d5933c2998
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, many of which point to potentially compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate that this PDF is designed to act as a link farm, directing users to other malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://samuiluxurytravel.com/Uploads/file/muxumezezun.pdf In PDF document text
    • http://masonhn.com/d/files/56125241728.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/kiwanususegozuluvo.pdfIn PDF document text
    • https://soltendance.com/stockages/files/18607815246.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/3850236966.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/44970113604.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/52591272736.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160785a2402a75---63890249872.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/givun.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/k4b94um4aptpe8kerbgec8j7b9/57788078075.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/bovipubusedaw.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/xigufogav.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/v26eaj54l6rpbtn8p1uhdk40uv/74419644066.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ad861fef26fca83fc91e7715be58d00e/selijunegupawiwivudivi.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/4mu6p3ublsbstgat8f93a205s5/femufopaseripune.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/36286408245.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/d3sdcejf8dg80r5f5jpqebpve6/rowid.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/tv6bjohn8poraqm36tp66hsgdu/69605967400.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cddbe1761f---futawo.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be97af106da---63060026264.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/20150634657.pdfIn PDF document text
    • http://ud2-140.com/files/47282349036.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/f0eih1f3hh3pq68a10sotq2155/50300133843.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd80f5069b---66035318038.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021071005530010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=bread+and+histaminePDF 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_off0000fbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCC 10400 bytes
SHA-256: 10f44bcda708377efee2f0081cc52358f676544f4ef645bed03ba2f5caa71344
font_01_sfnt_off0001131b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131B 17536 bytes
SHA-256: 8345743ceb54012a1925111833b216f082d23fb7ca5cdeddac8d3c3ac01706af
font_02_sfnt_off0001410f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1