Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd166b8e70c89b47…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 00:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3fe5e749aafb6e5bd9d4b718d408ca85 SHA-1: 555bbb2bb4bbf72873ec567d26faf74507c98fe2 SHA-256: dd166b8e70c89b47a02cf837084ced27c41fefeabe5e7f33103766b4f2339ece
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised websites or disposable domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious, suggesting a phishing or malware distribution intent. The embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://xn--p3t29jo1ed4o4xw.tw/upload/files/pamexexewogoruwu.pdf In PDF document text
    • http://garmagostaran.com/Upload/file/libuxefosikegefebo.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/9657814462.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/psuf6tap2eviom9ed3tkm6h76k/79529473976.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d81f32be915---15154886813.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/xopadasawera.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/baporizenirabamuzin.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160833d6d87c29---midufar.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/nujozunub.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/2766dcceb113f6bd447567daf21ec1f1/87232992023.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/49347023340.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/bac2453cc28e1be29f2735636f9c1a4e/71796598519.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/27927148925.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/tuladebadorokaluba.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097aacc52e05---62739488308.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210613041836.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/21779375900.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/49092562885.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/9a2f8e3ca57e8f1f8f44c84f0aa0b1b3/perepujubijiregi.pdfIn PDF document text
    • http://oodow.cn/upload/file/2107241848386751563ogymwcpkcj5.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082170d5ca71---72165118915.pdfIn PDF document text
    • http://allasclub.com/campannas/file/rixisijatifobi.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105251627366494.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/nebofawatiji.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/32453950865.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/tefexozibirofuduvoruxijow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=frequency+modulation+isPDF 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_off0000d8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D1 10868 bytes
SHA-256: 4536cfda5adb5b1690d379617c0d0d2c94b5001e325bffa0a2ee3eebde9ed50d
font_02_sfnt_off000109b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B0 17788 bytes
SHA-256: dea52d566bc6470e983e1ae127b338148b49c5c1048766381d588af067ba6dd1

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