Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d785280446d299…

MALICIOUS

PDF

75.5 KB Created: 2021-09-15 00:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97f1621e5f6e2f93d00a718a283f4227 SHA-1: b654a6f6004456850d557366660373e60a9bcaf9 SHA-256: c8d785280446d29931574adf706e0738a3fc827dc7535b0bda4ce49d82e08b55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of a URL referencing a movie title ('maverick+tom+cruise+new+movie') indicates a lure to attract user clicks. No scripts were extracted, but the PDF structure and link farm heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=maverick+tom+cruise+new+movie PDF link annotation
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/5docf94kmflrmgl6v2vd7v00k6/62274293121.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/jizimireviz.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/wasomaxijokipalixubunipo.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/49137294099.pdfIn PDF document text
    • https://norservis.info/files/files/jobezafixogow.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/jikojewepuki.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/getateguwexota.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/5289318047.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/risozog.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/vogud.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/paporuzikuvutujisibadil.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/8512331558.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/82357686843.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5e9010f92---wavinelujulatiwujowate.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/98538013486.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/58fa59afc45630a3c6eab8c85b5ab4fb/4022062683.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/ziwun.pdfIn PDF document text
    • http://ymmicro.com/files/files/sixovodofu.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/84357248644.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210913024829.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16132b9993d8fb---45458412612.pdfIn PDF document text
    • http://szwygs.com/upload/zawojunomunizexuma.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_off0000c36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36A 17100 bytes
SHA-256: 7bf3530bc75a922ac68d0074b558045c36306d0c742c9ea6847debb1a544fb43
font_01_sfnt_off0000f000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF000 10680 bytes
SHA-256: 6262053ca81ce53463e743aa5f9c4e1a8e92fe03e6fc94b2c1253daf7b0f33d2
font_02_sfnt_off000108a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1