Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9f79feb8f2b546…

MALICIOUS

PDF

76.7 KB Created: 2021-09-19 03:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d1b756712cd0933732b5586f72c9651a SHA-1: bc57f1a9cc3c20121a18be2e99b1ef475b9a0b60 SHA-256: 0b9f79feb8f2b546c03dc541327898297859084fce43fff06c7bd47c3055130e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=android+no+certificate+to+install PDF link annotation
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/096c4291dc45db535214e4b09e243031/80484426553.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/vazimutufudipatu.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/logedozugejekolabovekozo.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/a1b7372b306e584c9a89cfa0f72c390d/65290980752.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161361eb417a62---najovavofuzagedezivarut.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/jivomogu.pdfIn PDF document text
    • http://mosjob.ru/images/file/rubixemufo.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/majefow.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/zafesolewironob.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7b24eea6---22309092655.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/51991364769.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/21428440362.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/xupojuri.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/58070063689.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ead17d21e8---vujupaberegabujiw.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/tusemorodobezex.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/vimusowisizomuvi.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/sasekusexetakuki.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/cd1358a7c2e451f55fdedb5e23546657/39369488649.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/85de7aba75c36a8dd4f67c808b9bf9b6/73653039734.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16146383f9f6e8---56248280443.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/deponawigepezapozit.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/fejenufegawulewozox.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_off0000cb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9C 10448 bytes
SHA-256: 26b106aa6f58855f8c5e181968988e5a5098ca69f6293f5e790388eb9c0e5b6f
font_01_sfnt_off0000e372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE372 16124 bytes
SHA-256: 0cb7ab2ac51014b93925f73663ab27a0cd0fc78f7747bdca1b1a5f53ce44fa39
font_02_sfnt_off00010d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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