Malicious PDF — malware analysis report

Static analysis result for SHA-256 277af6cfef25419a…

MALICIOUS

PDF

90.6 KB Created: 2021-09-19 16:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 657fa0b0b8409a8d6e81b2858c5f2eca SHA-1: 53ff6bf6aa638308d5512baa0e9706282b1cd1ee SHA-256: 277af6cfef25419a70f407598054589acc84c9b8eb32f35fb6b1c769b530842a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm with numerous URLs, several of which point to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://capitaloffice.pl/fotki/file/83096220737.pdf In PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/56484842509.pdfIn PDF document text
    • https://novitas.ro/files/31583827199.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa712c6f90---sowejivirovutosogabo.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/62912115806.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/dubotofemivodejuvujewowev.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/77337763602.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210909_4C9C70F24087067B.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/b0d229c3e453b8dff3e0fc3f40c3bb01/sisajuxetigejamamefoj.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/tarivawiva.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/55682617381.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/17352776864.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/zaxadarenimoribok.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/39829453193.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/23707954443.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/7825449901.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/vusobuxatotebavinugapuxo.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372aa03c498---tikokumazaniwijekog.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/33178135534.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/44270944682.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161324192c6471---29515419837.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210914001225281.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/16112746901.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/kibadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+remove+account+in+messenger+2021PDF 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_off0000fbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB2 11064 bytes
SHA-256: 8befbce444c0eed7e8ca738e565d3370f292f156332da8a3e1445a535ffbff75
font_01_sfnt_off00011595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11595 17888 bytes
SHA-256: b02bed0f519dc3ad025af77babd25ba7c73c393744bab51958ba475e464cf127
font_02_sfnt_off00014443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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