Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bccea975034183c…

MALICIOUS

PDF

87.2 KB Created: 2021-09-07 10:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a275986d3836da94b08346907c226cb SHA-1: 4165af44339535a556d1c610109b2b0a04e6fbe5 SHA-256: 9bccea975034183c2e46e11a26e079ef70675df0d0ad0f43c6bb9338e3b7f5ad
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised websites and includes an instruction to disable security software, suggesting a phishing or malware delivery attempt. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kaitosushisb.com/uploads/files/44731132686.pdf In PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/66868938903.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429110251294719.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/54411939987.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078a734856ae---4714906972.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/devopufozaroboranoko.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070dbc9bb743---tukuwi.pdfIn PDF document text
    • https://goodline.by/userfiles/file/vedepode.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/23345487185.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210902164255.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/865c1dee098c4634a69f52700b91ddba/nesiniregoj.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ralifolotuzopajapudodot.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/98271340374.pdfIn PDF document text
    • https://superchills.com/userfiles/file/68782096575.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/02b7c44a75099e2c415b62a72ba8eb18/tupemorovujituxowu.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7056807ddf---voxenevupev.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/17767776048.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/wabedageworoferazazin.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/45710991033.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/2789422142.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/jemufezut.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/2624493701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=polaroid+zip+mobile+printer+user+manualPDF 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_off0000eedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDF 10856 bytes
SHA-256: e817f8a6375468dbbd8ae03b49e21bdf0b96445e3725f3b2d6b8c763efdc6ab9
font_01_sfnt_off000107b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC2 18148 bytes
SHA-256: ec4fdc4d63b6f0bffecf3d733a210633725450dd45661dfe568110b148c1f18b

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