Malicious PDF — malware analysis report

Static analysis result for SHA-256 d96295a8fede7be3…

MALICIOUS

PDF

75.7 KB Created: 2021-09-12 23:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1e9c412df01898cf1c4ed66e9c623ec5 SHA-1: ac8ae0d74c64e9734a36c43d1f844f971f3d7f21 SHA-256: d96295a8fede7be338584393dfcae76ba2b2e5905b6841b2c68643b3f01e0ba7
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs and the PDF structure suggest an attempt to disguise malicious content or redirect users to phishing sites.

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://datcat.vn/2018/file/fizonorarubo.pdf In PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/23662703140.pdfIn PDF document text
    • http://hocomesun.com/upload/tovifulofalotikomefa.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae11ab8859---gilofivanam.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/74819283020.pdfIn PDF document text
    • http://koutingchina.com/upload/files/bulanopekokoretixur.pdfIn PDF document text
    • http://profstil.az/userfiles/file/75032827216.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/51fe2a2f46e65dd183f8dab5dadee9af/lumevoropadijezegi.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/2289409266.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/70270814173.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83024261142.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/58pid4hnsvdfpfei123dh17q6l/simisesudedabitoxobitil.pdfIn PDF document text
    • http://cityfate.com/files/files/nesumuberifamunodeto.pdfIn PDF document text
    • http://knipia.com/userfiles/file/34627672279.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/36084627596.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/kolavovenug.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134268630758---kosamudedizoriwirolimure.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/26664675441.pdfIn PDF document text
    • http://marymo.ru/uploads/files/93726309781.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/86049658377.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/37701662543.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/37990681768.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/tevuloninupokenado.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/40576569551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=hd+video+downloader+apkPDF 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_off0000c31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB30 18136 bytes
SHA-256: a0e0425bc531ee56dca4b0db45914e3c901f7d924f4e97befd29a72422acc016
font_02_sfnt_off0001098d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 10352 bytes
SHA-256: c355b3c6801647f18a23a067e779f0045a79f971107698a8df1a511fc5fb2987

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