Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b66a14e10142b6…

MALICIOUS

PDF

76.1 KB Created: 2021-09-12 07:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0efd772bf7cf014d48715d335c03d521 SHA-1: 7f5900f138c4d25648b659dc46c3b6c9fc943817 SHA-256: d5b66a14e10142b6f8313b82f63f23b6a6ddebb06123921af17893e722e7f0b6
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly indicates an attempt to distribute malicious content or phish users through a network of deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ufcnagykanizsa.hu/userfiles/file/bodavomitimal.pdf In PDF document text
    • http://whkmradio.com/userfiles/file/6355647729.pdfIn PDF document text
    • http://innotack.com/userfiles/files/72009946141.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/sepili.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/mowarulovurelanoxem.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/62690770199.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/17024794051.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/35699548723.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/vovisepoda.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021932030348312.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a8b72b9b0---fosoxumafojozo.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-9/20210909055556625052.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/32904889365.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/7395563208.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/aajamj8cehv61hmqvjvkq9psk2/katonatuvomixezefazate.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/wutavilodemidazixaxivijox.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/lewirumekogoxewosimujiwo.pdfIn PDF document text
    • http://chemicalengineers.ie/images/pexofuve.pdfIn PDF document text
    • http://agrion.org/upload/fichier/wuxoxusiwojo.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/60276436105.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8c6c55526---fowopumesokajoporinag.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/88736260814.pdfIn PDF document text
    • http://attlas.center/userfiles/file/baluvejivikuvaxuguwoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=vestige+online+shopping+app+apkPDF 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_off0000c679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC679 17236 bytes
SHA-256: 943625ec68ffb2e4109cbbb8b6bd1ac1183aa52346be60da71c53aa9a35f0824
font_01_sfnt_off0000f320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF320 10492 bytes
SHA-256: d5085609d0e694d3b59fa2924067b0b1b73455c9448b3748296e28acc5933833
font_02_sfnt_off00010afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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