Malicious PDF — malware analysis report

Static analysis result for SHA-256 11da90008bbfca70…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 02:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 91a3b41e0bfaac63a6b7b7217bfc0d18 SHA-1: 2aac5dfd36ad868e783cba8915340d4e0929d645 SHA-256: 11da90008bbfca70c32437efe91d66c376453b6b602bf8a2dd58b789c496c9a7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings clearly indicate the document's purpose is to host and redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://surupaceanu.ro/ckfinder/userfiles/files/27645124794.pdf In PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccaf9a43eb---sozefilimukige.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/05/files/210530010810.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d7af7c6433---43464585453.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/kujamakegiladow.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/59636513379.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/43789690682.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c569805872b---gefabojeni.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/52132693730.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/95271900607.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/kewan.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/3de4u1ajqmbthrde5t179cu535/sujetozujipitugaja.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/96261846448.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867fd374eb8---toxuborogowutukide.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9e1f2c36b---rutilelorugofe.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/pugogowojaxumebib.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/2ff7869900b1943ab630a4414743e63c/72467956879.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/36729706290.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/80818231557.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/12507063433.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/87861510159.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/jrt2i1knp8eukq7rvbelm4nm1h/23057561710.pdfIn PDF document text
    • http://web68s.com/upload/files/26806469312.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/a73cda82cdabd1b9a3da27b301fcb5b5/mafasurifarutanezibaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=life+quote+memesPDF 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_off0000e0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BD 10168 bytes
SHA-256: 551ab1c7680ff8c138505347fa6ab0ab61e1ed526aa582345762ed7aaf5fd506
font_01_sfnt_off0000f78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78C 17128 bytes
SHA-256: 9b441d23a5af1873ab05735e8b7a0f2b13cec3b3fea79eace62f3f054affbd54
font_02_sfnt_off000123a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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