Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33a1ee7a18ffe35…

MALICIOUS

PDF

93.9 KB Created: 2021-07-03 00:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c653c19ef681888425287517bce6d8b0 SHA-1: 2302455680d44940e3a7d68a537028fba01126cc SHA-256: c33a1ee7a18ffe3570e72695c63fad4a76a0e30ad6bef602e75ef5762b925b62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. No scripts were extracted, but the presence of numerous URLs indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3i6bcckgh6apu3hsk154gbpbi4/63687527284.pdf In PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/tgonl67lic1c9qk185lqedavov/kowuwaruzezokuraguredag.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/telad.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/f6507898e4ecbcdbaa2507a80500a7a3/27442492368.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/25485434699.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/a2326f7346f9b00f0c8ff4dbacc45aea/44724288618.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/75131203336.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/tefamiwinapu.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/49868928021.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7256ce05f6114b4a1a43cde62a1a2ba1/22691712921.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/45538287823.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d894ea39---50141584149.pdfIn PDF document text
    • http://skncn.com/u/files/zurudufodidematuvor.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/5a5b0f135c26b031514b6ffdac1865f7/15510240666.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/jemazazepejake.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/8glp5iobnu4t0874kdia5i8g88/felotanujevutewubewonufo.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/ximema.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/cfabbb4cbecf0396bc4d25bdcd95a8fe/denekugikadewurabob.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160bc48ac05106---629149150.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab93ea7d56c---96872726701.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd619c30e0---48039786492.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/fnl166c3bk70est47sk06qo1a1/14601993614.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/02ue75p0puclv9dpeomopth75u/1943042923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=youngest+kpop+idolPDF 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_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 10480 bytes
SHA-256: 93048e93a6f230ac1759f92a082be94f1046c9f50f57694dc4c7017a18b31cf6
font_01_sfnt_off000101e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E3 16256 bytes
SHA-256: 271c4c08d5fbbe73233410a8f41e5cc112d5142542e7ea4ed1f63f37be6fead6
font_02_sfnt_off000117c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C3 1960 bytes
SHA-256: 483bf894ca17a3ea7653058df32ee1c671f7a41b51813e3db8a9a7ff5d19032d
font_03_sfnt_off000120c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000138d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D8 17820 bytes
SHA-256: e824d4d8069a8ace278cc15783a6b64b892bac0181dbf47b3e0fb2be9bc6c8c2

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