Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e55b51732d4576a…

MALICIOUS

PDF

86.6 KB Created: 2021-09-09 15:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba67510462e1ab11b6e924653f4df84b SHA-1: 81c387a12adda3f02e89975d2e4ce8c33fb24a52 SHA-256: 9e55b51732d4576aeb936cfe549f26ce4fc4c22d8d3afeaa75864a68ab495755
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 disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://hc6999.com/userfiles/files/pirebuturiw.pdf In PDF document text
    • http://thepokewave.com/uploads/files/botesepogokopuzopoweli.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/lidufigakute.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/zozijebewuduzokej.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/sowitutokuxumow.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/79115416633.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/1683052001.pdfIn PDF document text
    • http://fxlcd.com/upload/file/48192008095.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210908162938.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/dilezemavojenogajiladuz.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/21587820932.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16138190f9e124---vapabage.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/53312687728.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/faxir.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/fuvisumurivudupu.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090120523370554.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/8862b798208e8f11418a7dee616897db/99429776184.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/43695156369.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/13801949736.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16133dfb09b223---wasibizoxox.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/62045576929.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/83603233186.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/21867506139.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/25368990958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=wonder+woman+streaming+onPDF 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_off0000ebce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 18624 bytes
SHA-256: fce322ef76865ab84b751339513d7442e9229384fe05985de740a962c0f6c96e
font_01_sfnt_off00011c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8B 10624 bytes
SHA-256: 357444b7d9b217eecd8b87e17a0cc43ce3146710e553579d738374404bd2ee31
font_02_sfnt_off000134b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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