Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5592da4b9772de…

MALICIOUS

PDF

77.3 KB Created: 2021-07-24 15:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0b84661da822f726a2966a0956242060 SHA-1: 0a393f1db6d3788946396c85f9da1de5c9f6173a SHA-256: ec5592da4b9772deecc44982f51abc49138e39d229fbe000dfc359d62b57f535
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/vpunh1a565rof6mkkochs5c4it/vilisimorizipe.pdf In PDF document text
    • http://starrwindow.com/clients/863399/File/63232200678.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ebb5c60e0---rokuwabesejow.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/lunuvu.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/dovozusufesinigarunon.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097e321e32bc---33772326194.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/zezutanatar.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087bd27e93ec---65938514265.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d667e485dc---88998463412.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160da09daceaea---pugefovopeponeruximi.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/farovofepo.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec892616f2---55001529755.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/bonidizamek.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/66966419936.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55bf5e03b7---zetozojub.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a03705f3a---gogakomepid.pdfIn PDF document text
    • http://ps173queens.com/clients/10779/File/31901644012.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/41858241888.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/4ae2d4a257ff74ad6687adbeb88757b4/32397564703.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/nodimitek.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/48031684323.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/hafhu4vllbg6g5i6iguphsek01/vurit.pdfIn PDF document text
    • http://congtyvima.com/images/Download/12127510893.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/e9e9627564330925baafa6a023f8c11e/wiwonamenu.pdfIn PDF document text
    • http://yoron.net/up/files/lenonirad.pdfIn PDF document text
    • http://rld-carbon.ru/file/kivazuzetekaveduzabaxuvug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=metodologia+de+la+investigacion+sampieri+5ta+edicion+a%C3%B1o+de+publicacionPDF 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_off0000c368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC368 11496 bytes
SHA-256: 9f3bf839b9e64b0a63410eb428e42fe5832b92c8df497066bfee1e67f57b6c51
font_01_sfnt_off0000de00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF612 17472 bytes
SHA-256: af688304c43c29fd33907d21ee06ce3ac8a08049cfeb22b339ba4f35900e1f36