Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b83f68854e7555d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-02 06:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 10f603edf5a72ba89413dfd790bef8b4 SHA-1: 802164a9efdea18f79c6d495b572a89a5048237d SHA-256: 9b83f68854e7555df6e0974a2e8bbfca3c39cb8044c710930401cb5b84dc0819
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

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://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0975af0ff7---27185339667.pdf In PDF document text
    • http://ahdjcm.com/upload/files/70066306083.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/76817886148.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/55336085212.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/70099170719.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/mezijus.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdd34e4765---mugexajagilidibiluse.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/63157140685.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611408684406e---83572493016.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/3146067137.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/0csn0vqcj20ncuvfc7n6r8nrc6/5428947760.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/58920907252.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/95023429881.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/63881845933.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bec46dc75be---pofisob.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/4047829412.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/43789706350.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb886c33f7---92662263755.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/0eadddeea7ca5ec65b05813f3cdf6052/xubadipeg.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/jiremaguxiwikazokera.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160883fcc86863---55631973126.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/92217271296.pdfIn PDF document text
    • http://seamacros.com/upload/file/26827713481.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/revofewujagamaw.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078237b7793b---72396086591.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/sedudufelavifuzabemeza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=fat+and+fatterPDF 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_off0000df2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 19560 bytes
SHA-256: 09873f62a189cebb76213867cf5901841bb6e9c17472ac0af0ea9fcb82e613ac
font_01_sfnt_off00011239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11239 9900 bytes
SHA-256: a6c5cb1cdda08c2e70062c29ca94c7137151ed91b96a19f2b3d33a9b9b7c4454
font_02_sfnt_off00012822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1