Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac30eba7e6b6af4b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 17:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0ff37a377e58f93a4bd40928da03a089 SHA-1: 8c8bcef8b519b7e630025b99e325ae0544ef14f9 SHA-256: ac30eba7e6b6af4b09839bc1a7d21aa97d7f63a477f04bacdcd0dcb433636f88
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=how+to+recovery+mode+macbook+pro PDF link annotation
    • https://linlinline.biz/js/ckfinder/userfiles/files/35688028338.pdfIn PDF document text
    • https://trainova.com/userfiles/file/81107345851.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/vafikovupiburiwonod.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/fugupifikitipafejiri.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/83705373320.pdfIn PDF document text
    • https://cooperspick.com/files/tosipezujufamiz.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210905135431.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/h3f8fmqslbhdhupj9gu9n0cug3/mibifedufigizafosoju.pdfIn PDF document text
    • http://hkalc.com/userfiles/26882629185.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93290532645.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/torofeni.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/wotojolimonaxujoguvukubox.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/83002423983.pdfIn PDF document text
    • http://henca.com/files/details/file/koxeworatar.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/d4d8d164a008419507e617592151f54b/90583573947.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/denigoregedijozox.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/35870964354.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/54562008716.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368b8e5a914---puxuroreke.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/39709697254.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/54aa1a86cf9e945964fbc222bffafe98/jejegiroxoladujeji.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/xofibufinexujeripivamapux.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_off0000de62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 10752 bytes
SHA-256: 8ed428f460b11fd72f9bc7f85b8588239b9646d9f78c74c8e1d00bc3523bec30
font_01_sfnt_off0000f6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FC 16920 bytes
SHA-256: 5f9217278f679e8fa813bd881f8661fecec2f2122c1eb099777c35d2efa631e4
font_02_sfnt_off000122f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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