Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c50a4c9bb9ddf2…

MALICIOUS

PDF

74.1 KB Created: 2021-09-05 08:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d69119eeb4f6137c25a119fda23f1e6f SHA-1: 8c3d368081ffa2a0d67f30800d0dc9ac613ae209 SHA-256: 21c50a4c9bb9ddf20e335a2a5288d0824513d76ca080456c8fbb311757027d70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript, though not fully analyzed here, likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=jurnal+infeksi+post+partum+pdf PDF link annotation
    • http://leebyunghun.org/new/upload/board/files/forola.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/12648432226.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/37362201465.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/26uoo33mdu3h81nigfu4me0gmo/lizolutomelaterarisinivig.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dcc60d8e7---54628708880.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/bitusapesemo.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160af7afa9394e---vodakane.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/lupopamobilagawumowoz.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/0a9feeab014227d27b5ab9ba76e845b7/97899032667.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/44312108491.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/tajuwawebutuno.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/31954128872.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/xawod.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a25e5765c5c---75251825133.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/7461058767.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/ropirik.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/rinedanotifufimovexiveb.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/dozamakuviziselela.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/22139114392.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/29330447037.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/mvfgi3v8io0gh8sq8o0nu1ifmm/53978061199.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/75d0f7059969d03d8056067c708a0a08/10437084521.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/32708066928.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/jeniwomamijavosekakij.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e207d87a---sodosu.pdfIn PDF document text
    • http://dx.doi.org/10.358In PDF document text
    • 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_off0000bf60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF60 10844 bytes
SHA-256: 6f40d5099e354abec6b20d8e0c19298f9ad6981c5de42f92ad955e39bab465ca
font_01_sfnt_off0000d861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF073 16772 bytes
SHA-256: 7ac7b9de99bc7547ff66cb4598cdd4270aad3e6a107a2b93e75631fd08729356

Open this report in the interactive analyzer, or submit your own file for analysis.