Malicious PDF — malware analysis report

Static analysis result for SHA-256 63067e7f3790e97f…

MALICIOUS

PDF

89.9 KB Created: 2021-07-19 02:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 53a000a1198e596347a316f8ef3c9ab5 SHA-1: 2b02cf0d96a6267fbf2ccd43e763a9917f65ba85 SHA-256: 63067e7f3790e97f55d5f0d9b96fd4ae316183ca9908c715da14ea349a3faeae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of multiple links pointing to compromised WordPress uploads and disposable hosting suggests a link farm designed to obscure the ultimate destination, likely a phishing page or malware download server.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://citranco.com/users/files/90363153469.pdf In PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794370161d3---83472817196.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b997b1c2b78---kagixikabamaviro.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/2fc670886dc0f0f8b6111c884d3ca916/lagudo.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/bugenuzuvelena.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/nuluf.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b48748a52b7---jojufudiwegevowefaxoka.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607be5f0e6557---vuronizelujalag.pdfIn PDF document text
    • http://stevis.cz/files/file/mevorovorema.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1d2bb257b---gubajevu.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5690ef49b---delefamorolel.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bbae4b5ddf0---8982412903.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/d6502a7f7f8487f57d1c17aa109f21d4/bomugorudaxiwimusurak.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9dd98de09---65746326089.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/35916590702.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210623_BC95E0DD22D24AD5.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/dimolunogesirisele.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/kivozofugitol.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5cc7d53e1fb4a6d1dfae81ea3d2f25e3/25742080989.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/telawakeguvupo.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/guziwotavifemeni.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/cbe9591d81e5f4f3f59fd3e448761839/73615561482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=nursing+care+plan+for+labor+and+delivery+acute+painPDF 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_off0000f7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 11192 bytes
SHA-256: 3b6f4e7ceedd8e33ce6d350dd20fbe76eb9852747c077ec6dd28d6248e5c3788
font_01_sfnt_off000111e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F3 18632 bytes
SHA-256: 37ce6d8b8efe52c9e13b26b0448e53200f9d44388299c077944fd1dc78119d3c

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