Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8636e5a24751905…

MALICIOUS

PDF

90.9 KB Created: 2021-08-22 02:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cff96418d2192169b5f57498e33e5604 SHA-1: f0643224615380d970638f584c450c5707adb38c SHA-256: b8636e5a247519050e220053897625fd06e5e7c60866e038df35f70a8d62e5c1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous external URIs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://laborke.ru/uplcv?utm_term=online+apk+oyunlarda+hile+yapma PDF link annotation
    • https://alnahamgroup.com/userfiles/file/89083547847.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/77321419417.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161085159ebb6e---91494664101.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/vimusasijorap.pdfIn PDF document text
    • http://firegallery.ru/img/upload/xufijofatovinilemapixig.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/24539968103.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fa220f248a5784edb63622f768ecc2c1/29891006099.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/20/file/20210520_234122_177.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/xovuziki.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9f3d6d01c21300a40a3eb696dd6bb67e/17430125239.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106081804075729.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/3baae0f7055a4144bc7ebac1e287bb4c/sutomivu.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/waxekoxemiwijegorupo.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/44e3a33dc68d67a4fe88cd4712c30886/xazutetibavodeguri.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/gekosozowopipupibujirut.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/13364217364.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/cb4fc0673273df3393b308a92402d57f/kivenarejorebatozuvas.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d190023f8f5---bunojawunivabefepakovow.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/ptmuafcojoqq7g4un2cucpokle/volifefol.pdfIn PDF document text
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/xoforodinomemuwo.pdfIn PDF document text
    • http://demkapi.com/resimler/files/61075154614.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d18aae0287---94179145774.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/dapiwotokisilomupenajo.pdfIn PDF document text
    • http://asmolmerdiven.com/depo/sayfaresim/file/sagela.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_off0000fc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 19312 bytes
SHA-256: 330e949d0376b3216c43049de65e57eb78c4b8a786705284921a6ece960f108f
font_01_sfnt_off00012bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E6 10720 bytes
SHA-256: 449f2b21b099743ba3f8c1b39a06d93f58b72ac5b6b8ebe34ea8b689abb2431e

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