Malicious PDF — malware analysis report

Static analysis result for SHA-256 2597366725a92661…

MALICIOUS

PDF

89.1 KB Created: 2021-06-29 01:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 60635b1f68a2e659c26a4aa12ad4feb4 SHA-1: 22d3addce34956a80d98c85cb65717e8af4631fb SHA-256: 2597366725a92661d4c04fb43f7344b5aaf2eb51aa7214115a20109afd105c2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, which in turn host other PDF files. This structure suggests an attempt to obscure the final destination and potentially distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/882a19d86972d0d9018bd3ce7700ce8d/22146437902.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/oiovvvr1lak51cmgod00r55rg6/7787527175.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/wenukotutosade.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/fulutelebuvam.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607a018d33bfa---rubugalutenelekudoki.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/9ef5098583a0b09f5913d220e9b49b23/geket.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/86851577070.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/28ed174fe318c7381bbd64458aae4297/50358228022.pdfIn PDF document text
    • http://boxethai38.com/upload/file/36242164013.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a0813aef8cd49931dcc9f329d31c5bc5/34048170771.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/f6c73cfbdc52faf82fe2d02b465fd1e2/livufadunew.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160878350f047d---daruzasig.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/4062c8f5c44c52a61cbb302019f81555/disujajuzutixoxevifezebiv.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/05915fb3d5119e6d0fa46c59edc5084d/25302447311.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d195b24dbcd165783b8ec93a53761950/14596485828.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/323bf2d4d9923436b3dd2ea59de5b812/nizijuwizuzexok.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4ecc963ce---lazipagegagixinu.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081ba32c491f---wunudoguzujupebakepopesa.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f89bbd7aecc87a4e142f126b03ee3b17/ziliradewobizajugu.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/32667792667.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac9390af59---kejok.pdfIn PDF document text
    • http://armanetti.com/images/bozevoxufene.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/731b30e07eef7ac259e5207d067bb772/65248124839.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/pezakofimipimanutax.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/72221513589.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8b7253784---direxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=as+soon+as+possible+abbreviationPDF 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_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 17712 bytes
SHA-256: 92a5d44d1f249e85e302173a6dd6c8fdea97490059b567dde7434fe14271f133
font_01_sfnt_off0001275f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F76 10432 bytes
SHA-256: 6a63df3d41205a22fbcbc47e3d6f54b6f7802400f3aaaa85c050756de6bf7a8f

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