Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c5236434934670…

MALICIOUS

PDF

77.2 KB Created: 2021-09-22 19:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fab4593d7691f2e454bf5b63d9034cff SHA-1: 5980a755300f93b9e1f04065124263a98c25d8fe SHA-256: b0c5236434934670f4799e62c36e55fbddda48fba4861b8f322f732f3221b994
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://nomylo.ru/uplcv?utm_term=prince+edward+game+friv PDF link annotation
    • http://brilspa.ro/userfiles/file///65758925329.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161494aae80313---80835861062.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d13bb12697---pojuro.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210909070959_bawi2o.pdfIn PDF document text
    • https://educhina.mn/editor/files/25422354680.pdfIn PDF document text
    • http://medi-sen.com/files/files/18464119382.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/wefipi.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/8877105224.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/j96e1eiaqq5tr164qdshqb49e0/50728233087.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/zowesiwumovilodep.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/fobukorujuwikojuto.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/faselupulazijazasalosimup.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/kapun.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/51055119549.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/pilukapime.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/liwitajije.pdfIn PDF document text
    • http://dmkert.hu/files/file/62955254682.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/powisiderolij.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/12035213510.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133831656b3a---tipinimupuzu.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-7/20210907221503700053.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8e7183c57---gefodexugiro.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/wikebazotebujixad.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613541fabe1f8---4082486807.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/lejisebibibofiletave.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_off0000c4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F9 19240 bytes
SHA-256: 18e2ba559eaee8c97e566b48bb39beb0dffd5b8523163c83bf4169365071e588
font_01_sfnt_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5C 10540 bytes
SHA-256: 049fc116eabe177182ca709f47bc2b7d5515b1ddd169458c97dbbf7b74c8f3aa

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