Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13457d1362cd236…

MALICIOUS

PDF

79.8 KB Created: 2021-09-02 17:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5bc428cd614a5afc95a50e98dc7ffb99 SHA-1: a8f735c31730e10ca05094ff2138728b3cd74ff0 SHA-256: b13457d1362cd236864caaa84f3f393c3654f14f5c1aec6d343f34298d46e9d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or malware distribution intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://chcial.ru/uplcv?utm_term=conditional+sentences+all+types+exercises+pdf PDF link annotation
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/jobakirilan.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/lg7uv26v2hp8u9a650289ocg66/bigigafikawalo.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/dadugojurimoriritiwile.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/20881251452.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/viwekax.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/jutozuvalodetadarasiv.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/sedojirozureresuzapon.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f286f5cc72---vipopiniram.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16076d7f6a9c2f---bivigobidiwodirexo.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/21961256861.pdfIn PDF document text
    • http://edallyshop.com/upload/files/rixosogijulalusuvenerozax.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/78979486332.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/zowezowewusugefitames.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/nevasowunibatere.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b56c5e64cf2---49882797516.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/34835900554.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b16dcae74---92759004046.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/11562919293.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/tefosonasawajewenogudim.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/dorojofatojebovilupus.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/31752946380.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/tkt60rpmo060srtg4n0ajio744/tosasesoz.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/acqhheuljnbmtfl5n0idcsk1pi/lobofozogipafo.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/58054202366.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/94747839998.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93cb6dd06f---guxugodofasajozujixuxib.pdfIn 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_off0000d2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ead2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD2 17344 bytes
SHA-256: dde1e3f890ecd73b4981b681d94d04421cc62970e1d2101d7cfe7f71a92c6e94
font_02_sfnt_off000117da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DA 10860 bytes
SHA-256: c58d1a7c74bba14576db17723dc64cc23306923cb342bd4e92236aa4b002138c

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