Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7856219c312017…

MALICIOUS

PDF

96.6 KB Created: 2021-08-09 00:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6b9196002a4a837ce133d3330a7d126e SHA-1: 208c7bfd74d4a49a2be838ff929f5b4015139455 SHA-256: ff7856219c312017831578993b57c3e3db6ff12ebbb3d241a8859d578ff3b8cf
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URLs point to a common technique for distributing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/179d9dc3704c6efee1607b7fc08cd7ed/45667868079.pdf In PDF document text
    • http://goddesshair.net/upload/users/files/zokizaluvibidifekedi.pdfIn PDF document text
    • http://ysenb.kr/board/file/editor/file/57227888482.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/zurojigumedibupev.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/wonijosev.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/nexojijikimafujal.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089585a45dbe---85499998139.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/d1c90ef624434f6610959721755cc1f7/wotezuxagifotamiwumosa.pdfIn PDF document text
    • http://ozari-ua.com/files/file/85740228029.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/mapasurujajazowixiropumo.pdfIn PDF document text
    • https://dacola.com/upload/files/19295281954.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/87101300115.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/md32jgg8mamb8g4kfo3tveeopc/vipurobudaritut.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d184f2960---fepedojala.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982a58b4106---52041479345.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/65264390231.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/tozedoxapalasowonafe.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/ff1s2gcjhnehomhr7hjfjiakmp/kokoreduxikujupejokazoj.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-7/20210607195515551041.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/c2a4fc9f8f7f0d0568ef3eb2e1fb8e7e/katavakukal.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/77916ea9aeba64aca8d7591700e64bf4/fuzevum.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/e90b852edc424b3837f40ffb882fb380/zixasuxanixidedaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cadette+woodworker+badge+requirements+pdfPDF 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_off00011069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11069 18028 bytes
SHA-256: a0d0201b81222dad67aaf36ef56d533637f314cee24e7c126577543cfa4edf6e
font_01_sfnt_off00013fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000157ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157EF 11388 bytes
SHA-256: ee61e869f68c4457a2e1d49f8de4ac9c8e8a428451b39c5d2b178d71ff170810

Open this report in the interactive analyzer, or submit your own file for analysis.