Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aaadad5ad5ceef2…

MALICIOUS

PDF

93.9 KB Created: 2021-07-14 09:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c4e44c5bc8b9cbc31337d8a6101404c SHA-1: ef085f4d7356a1ea60b0c355790487181a7ea990 SHA-256: 5aaadad5ad5ceef2ae9e63a283f468f2bfe36d73d9855f55d12cb947d9e5d341
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers strongly indicate malicious intent, specifically related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=letters+double+vision PDF link annotation
    • http://billsky.ee/files/file/kulogorexexorinil.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/rugaxapibegu.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/1038f91b00f7750807689bde214141c7/xakowunukowalan.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160917897bad58---97652127815.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/kh1dnmpnqji56dhov8e0slf16k/zibodokagikubepapud.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/terileruxorobunolilutupew.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ae1f50721a1dbdfc187de4b54c30cc0b/zukoweroridelu.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/kixumibisefawewagakori.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/451e768fab1c86866e3ed94af47ad5ee/sujiparejebotoboxe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af0d53ad22b---76859659950.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160cf444910043---gesozudidep.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/bedotid.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/88796933809.pdfIn PDF document text
    • https://yuss.it/file/nomamonus.pdfIn PDF document text
    • https://tempegaring.com/contents//files/907736704.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/85405479043.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/83010047610.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c38ed0d5cea---tizusazited.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ed96172e5---lulubepowefamutajokotu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b57d06d7b8---puwerelur.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed59d579f9---88486297185.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a359e70d939---67262902747.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/23292372585.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_off00010cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C7 10340 bytes
SHA-256: ad8ec9e01bab15694311e480665240423be634b92408f4388306ca4c784a5e13
font_02_sfnt_off00013c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C35 17556 bytes
SHA-256: fd763a21705c34d9c671dc1096820760a956c20d33fdcd55d2eb3bdca6497f80

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