Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e9b1f8f01090ad…

MALICIOUS

PDF

77.8 KB Created: 2021-10-11 00:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6cf3ef6cb042d2820e184ceff68ee7a3 SHA-1: 6f5c74ee4fd0140d37c91e7d641e8d26d1fa3d21 SHA-256: c6e9b1f8f01090ad8350027da379a2b0d01860d781259d19491a0b301f8686cb
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to compromised WordPress uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://catamma.ru/uplcv?utm_term=aries+man+and+sagittarius+woman+sexually+compatible
    • http://vector-food.com/userfiles/file/47027558873.pdf
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/kerajan.pdf
    • http://d2dgroup.net/upload/files/pesin.pdf
    • http://yuha.be/_files/file/sesom.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615aa9f683c71---63242721573.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/c52ace859a614bd10ba224488a52c5c0/vitipunozixegujuw.pdf
    • http://assotechne.eu/userfiles/files/sutoriz.pdf
    • http://carzip.biz/files/uploads/files/doraxumalavaja.pdf
    • http://indianmailbox.com/assets/images/userfiles/files/dilig.pdf
    • http://pure-chiral.com/upload/files/gifaweparigubog.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139e6077eb87---tepogabi.pdf
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/16199500823.pdf
    • http://mobilahomedesign.com/userfiles/files/99069873601.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/wijosafubivugos.pdf
    • http://pactolous.hu/upload/file/femaziwepakunewerelu.pdf
    • http://studioarchoggianiepartners.it/userfiles/files/zadekukunokevip.pdf
    • https://sadhankendra.org/erc/media/6937529881.pdf
    • http://iuoooo.com/filespath/files/20210923104700.pdf
    • http://morard-mcf.fr/data/Files/xemikuxulirupenetabeze.pdf
    • https://agape4u.org/userfiles/file/211171022.pdf
    • https://castilloexterior.es/ckfinder/userfiles/files/88821244823.pdf
    • http://sualpturizm.com/userfiles/file/tepipogufalubor.pdf
    • https://buka.ru/sadm_files/17674556609.pdf
    • http://ctkupavna.ru/upload/file/mugipal.pdf
    • 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_off0000cb4b.bin
48ca7a0d6d9c9e0c900b5772b9dee0c3d2f1164ee3b6c1dc46fcabd829e159ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4B 11380 bytes
font_01_sfnt_off0000e5cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CD 16792 bytes
font_02_sfnt_off0000fddf.bin
24b77674d239ac69e432cbb7db10fd65796a9217a8a3ae797c420fbc41100890		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDF 17080 bytes

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