Malicious PDF — malware analysis report

Static analysis result for SHA-256 9968cc1f0297ca33…

MALICIOUS

PDF

105.4 KB Created: 2021-08-03 17:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 11c8e33a8c1465ed5de69f24dc1e1fb9 SHA-1: 7498562fd2ca586dc0c235bbf44938134d38d440 SHA-256: 9968cc1f0297ca334793174e97d1f63c479a12449dcd492470f66f42c23ddc9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://ofipapel.org//ckfinder/userfiles/files/zukexate.pdf In PDF document text
    • http://saothienemb.com/uploads/images/files/75966219637.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/o4j22sqgtjtiofgorb4n8676k8/8059705624.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/76503844076.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082968ed1a92---87732734071.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105201008096900.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/67808614318.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8ef40483e---simepujipewugu.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/13280706369.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/lapivim.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/296b46a63c1d66bef1363a4f2ec65d21/donobifi.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/7tts8l9dajah107q8487hhdljv/turawokajoko.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b363e8e169b---22772469107.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/64664974698.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5b9c351c1bb0a95e29fe476bba90c955/32313381448.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/93468328754.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ad4ecb56b---zigiri.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/4d66a44eb17b2d132701a08188273d9a/75571604867.pdfIn PDF document text
    • http://haki.vn/uploads/files/dorivalematiwepedi.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/gogewusosapijalepive.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/35591748779.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a400817b2d0---gojatujudenomepadudi.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/b11f52def409b7d9420091a2b5d3deed/tolepolibodemedoto.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/37657999544.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/dofukovoposidevadesupevuf.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a0b9ebfb3---jejavuvepupoletobikib.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/vofosufifixizazekiwaledu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=scaling+lean+summaryPDF 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_off00013983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13983 10644 bytes
SHA-256: 75a751bade6d51faab3528461af0874c85a2873298d31d0bafd7144fe7d08add
font_01_sfnt_off000151d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D0 17312 bytes
SHA-256: c8d7a712421f2d5d49e7e15f82aa1ebae501a160380b930f27dd2f077bf324e9
font_02_sfnt_off00017f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1