Malicious PDF — malware analysis report

Static analysis result for SHA-256 20fa9ff28011d780…

MALICIOUS

PDF

93.3 KB Created: 2021-09-17 06:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4070605d5aac4e567b2352594fba7658 SHA-1: 141d2bc1ddc068cb6d8d16f3be4b64776ba702aa SHA-256: 20fa9ff28011d780768f53ba70fa973c87e0c5e3ffe5af22be2a71b982ec2d6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, directing users to potentially malicious websites. Heuristics indicate these links are hosted on compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=free+watch+anime+online PDF link annotation
    • http://benthanhsgfarm.com/images/uploads/files/35790948329.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/eb2c0d8dae56edf9dcd7cd78be5cea94/16350625489.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/23310058029.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/zadelidumukigenata.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210903111028031.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/vge89cid8fnint7qeh4bc9hnt2/xosagexuvos.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/zoxixulopexagixuderezam.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/65907513533.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/xikoxosimadaxiwapakuwub.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/411fffd0c0a6f9583b9e3c9a27604fa5/jezafikiponilovede.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/33055699439.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/48980087481.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/lelozabo.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613711bd1578e---60282944574.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/77381688966.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/v0v93k8ratobbk1fsh8dbogbil/bopuxikuzinadubif.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/82807506399.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/36992622441.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/99814738920.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/luvanodo.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/dixubimaromezor.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/pibugedibekagofadivemad.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_off00010a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A51 10388 bytes
SHA-256: 323ac8994edbfd26dc1b4c545fd0ac809c070c41f530093faa5c5335132939b4
font_01_sfnt_off000121a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A1 17684 bytes
SHA-256: 802306adbb7dd5897cca14cc608265ae80348c58d640d26af386e07465c5fd35
font_02_sfnt_off00014fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1