Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb590a0770196648…

MALICIOUS

PDF

93.2 KB Created: 2021-08-02 07:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2c90614e33274bced2fcc2001ca2c395 SHA-1: b1dbbe5de94cc13640bd5d23b0659431150f7419 SHA-256: fb590a07701966482779eb3ccc143f13e31bdbf620478c65c55dcfa43ab9be68
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised CMS upload locations and disposable hosting sites, likely to distribute further malware or conduct phishing attacks. No scripts were extracted, but the PDF structure and URL patterns strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://sns.hu/_user/file/61847892446.pdf In PDF document text
    • https://martensmgt.com/business_school/uploads/file/fefunuli.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/8e2dc4e78bca04d7a59141da13fd140f/66576878707.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/e8fa2f3fdfe46a9b21e5d410f23857b5/fisajuwasokuduvo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/8b3e20df9e0e506f16f537e541b8a531/xipegefezabidovofu.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/talewufojelaludadabomefu.pdfIn PDF document text
    • https://parfumzone.ro/files/file/53676891561.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/guramowowobide.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202107071037582421.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/33274170531.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/raduxudikazabo.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/4326464517.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e535c26628---25334843744.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1a21c3d95---7318332699.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/8bd86a74d45c9cc5b0ac030a4eebb214/mopipikiku.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075c8be171bc---rewugidetolaripugitamev.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47b0999b03---52000606693.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160965fa14328a---bebanonodefojivodupasow.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/zifivugoxajigomatokug.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/gukajoz.pdfIn PDF document text
    • http://daebokjungdb.com/uploads/files/86985802234.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/024bada174d1f14eaac57eef07c3b482/24917168845.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/22597344559.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/46595445561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+level+is+minna+no+nihongo+2PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10044 17616 bytes
SHA-256: e0b092830cb76b4bf4b3f7ea613e6487521949f6475d3fa56e1fe516ad45a003
font_02_sfnt_off00012ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA5 16104 bytes
SHA-256: 74d5ff912e5206794c4c5add27155c5ce5cf5e1ff194f0a33f59226646a82e31
font_03_sfnt_off000143e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E7 2260 bytes
SHA-256: a722647d01722aba37ad0e59d884cbabc52765c22111738f5b0bae0362293870
font_04_sfnt_off00014e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E2A 10636 bytes
SHA-256: a37ef5d24eb42da4afaeaba5ff21c350cc93174cd389ceccd5ff0169c2c00e5c

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