Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad130d29090ac73…

MALICIOUS

PDF

75.5 KB Created: 2021-09-09 06:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 071746049404d892e92e088ba11d6e78 SHA-1: a207b421401de22951b6f19691a973a509f4c6fd SHA-256: 3ad130d29090ac7369400f54cf094b356a76a5abb87d4ce19dff9ecf9ad28833
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the document's purpose is to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://inspiredindianfoundation.org/uploads/wolero.pdf
    • http://lblussana.it/images/file/betemenojujeveweliviwapat.pdf
    • http://eko-baby.ru/userfiles/file/zinifolege.pdf
    • http://orderbestwings.com/uploads/files/dalobokipobapulazi.pdf
    • http://naturalfurnish.com/userfiles/file/30315001807.pdf
    • http://tongchangkj.com/uploadfile/file///2021090603432826.pdf
    • http://www.europesolidaire.eu/userfiles/files/laberenipenabipibosuvedaw.pdf
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sefaxenibedebirisudetomub.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/30844965a79c75795901a3021c89f70e/nokozukilipelanafezajexe.pdf
    • http://lagunaapartman.hu/images/user/file/64625751930.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161321101863a4---midupepisexogufipewata.pdf
    • https://auditorescr.com/ckfinder/userfiles/files/jonuferusuf.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16137ab000449c---72746880855.pdf
    • http://lepal.sk/ckfinder/userfiles/files/lurexamovopetiv.pdf
    • http://freeware-software-download.de/uploads/editor/file/32938573457.pdf
    • http://clinicaveterinariacene.com/userfiles/files/mefafiviwujuvelunurajugi.pdf
    • https://fizjolech.pl/userfiles/file/parujerubafaroka.pdf
    • https://hsiaoying.com/userfiles/file/lorurigajofexusezafa.pdf
    • https://skykharchono.mn/editor/files/67295055527.pdf
    • https://amd-export.com/site/upload/file/kasejimetejawodomowuga.pdf
    • http://piotrkowska77.pl/zdjeciafile/gubagapalejonotu.pdf
    • http://solemarservizi.it/userfiles/files/kujivoxedanoriralozeju.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=cool+maths+games+bloons+tower+defence+3
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c308.bin
fc37cd6eb522201a001e0a574e3236dcda14921ac47d7d7639700f60745d25f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC308 16796 bytes
font_01_sfnt_off0000ee7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 16792 bytes
font_02_sfnt_off00010696.bin
7dd99fd51fa11dd85739420bfa033731785b4713fa0b2cbb612250f869dcc5d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10696 11260 bytes

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