Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da18d6b2c6239cb…

MALICIOUS

PDF

84.6 KB Created: 2021-08-10 09:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 204076df0ceeaef0f726e588ae6b110d SHA-1: a15b5bfa1bebc0aab91064456b6ef8c09586edf3 SHA-256: 6da18d6b2c6239cbacc15c38fc72c8ff0e68dcf988923bb87b1b4c4b0217d083
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other hosting, which in turn serve other PDF files. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/g05gbh5s0rofj1rirs5jkr2f21/buxirujaweduxide.pdf In PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/24d15e217f5fea780ce398d5bdabf2a8/zezesetabejoju.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210802125121524502501.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/jasebowixupin.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/48056293414.pdfIn PDF document text
    • https://fallsplat.se/file/23080987935.pdfIn PDF document text
    • http://atomleasing.ru/media/File/78959016198.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/bonibefixubazinelerinirox.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a866f985a7b---sogemumugaxesosiv.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b34b20321---zinonoxusubolofasewebaxu.pdfIn PDF document text
    • https://esz.jp/img/editor/files/tewokizedodudijonediv.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a49853fc16---goxigirunuri.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210617182356_o207dx.pdfIn PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/04755f2a07aff5f6150ac6685fccea4b/pazozawejuwixupoxitopiz.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/58057066664.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/21687567016.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/zafovusagojakose.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/9b3b6b9a0bafaee9df5c0d8c82147512/83178416090.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16081d5b713975---lirowokixura.pdfIn PDF document text
    • https://bliznacite.com/files/lojopega.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/xolavewolarubexe.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/fikonupoturefimudixi.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5331be472---1251760763.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/93533666924.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/50328394401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ejercicios+de+plano+cartesiano+para+ni%C3%B1osPDF 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_off0000e661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE78 10824 bytes
SHA-256: 2b0547557cb74e3b2374f8b37f61153e6281800ebbdaf484e959743af9c289f3
font_02_sfnt_off00011737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11737 16752 bytes
SHA-256: a61f607c404eba786e1a99cd766a5204b353037ff9b5f54861dcbcff2972e1cf

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