Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24986c2c72f472e…

MALICIOUS

PDF

73.6 KB Created: 2021-09-13 03:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4aca41c6137cc297482f4d75a8170d7f SHA-1: 1b8db17e41aa251e6026b572f521adf7ce16b588 SHA-256: c24986c2c72f472eab1eb1b40d1a82e19af78ea6ff3454fd2786a678dddd4976
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://psychologkmalinowska.pl/ckfinder/userfiles/files/vawewefipinuzasiziriref.pdf In PDF document text
    • http://solmoda.it/userfiles/files/boxolofewotonifijos.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/9a7d4f8ac561c94b450b0225846e4c3c/20776700359.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/tibibetufem.pdfIn PDF document text
    • http://premo.at/userfiles/file/90830050028.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210905083707.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210906150934.pdfIn PDF document text
    • http://nut-shell.net/upload/files/pokipivofajexamenivozowe.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/nexedun.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613915643544a---fonadek.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/75749344231.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/webudazesalake.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/babazetofovabukusolukowag.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/6fbee0fc897a5bd6836e74db2400a854/tokojixasibafatepexexomin.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/82602968185.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161391da59738d---21306904383.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/devupanubunipe.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/92116102420.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/47486093472.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/89155781414.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/sofedidexu.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/29255474497.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/82529493891.pdfIn PDF document text
    • http://allycatering.com/userfiles/36332011025.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7a20c6ae7---mikasekokapinoluje.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/ppljb1362klbj460d8982lhhsj/20990856140.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/30528839836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=free+psn+game+codesPDF 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_off0000bbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FB 17596 bytes
SHA-256: 693faf31ef9f6b85915d2f3dc54e9314505d8b4565c4e59db9410c29c2520f09
font_02_sfnt_off000100d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D1 10600 bytes
SHA-256: b3b8228db5c0d1c872b0feea9646ce3990f0079b023c71dfffedba0e1df273a7