Malicious PDF — malware analysis report

Static analysis result for SHA-256 786ac54db864af98…

MALICIOUS

PDF

68.5 KB Created: 2021-09-28 18:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e2b1ab173c51e754054259899071755 SHA-1: 87ca92faacc8dddae85a2b84c672fcda277d3262 SHA-256: 786ac54db864af9814374b2ecf745055867d4010db95347431506601e8d197e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botosani.ro/img/uploads/file/buwaj.pdf
    • http://www.painters-restaurant.com/userfiles/file/zejuranopebaropuv.pdf
    • http://coeb.eu/userfiles/files/bikosuzidamam.pdf
    • https://groupunsur2.com/contents/files/juzesijesejilatejetasune.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ff4026f8a---98612792007.pdf
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/5050467077.pdf
    • http://dreambeauty.kr/upload/fckeditor/file/rekupogolikunedepona.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/6884599701.pdf
    • http://citadelcaralarms.com/userfiles/file/jobuwusozanetobamerod.pdf
    • http://thanuyentea.com/ckfinder/userfiles/files/lazowuxufavevibe.pdf
    • https://hippodrome-compiegne.fr/www/uploads/file/solefiroku.pdf
    • https://luatkhangthai.vn/upload/fck/file/21152118435.pdf
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/19817392204.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161305f0c337fa---gitenamikurapeg.pdf
    • https://myphi.biz/nbloom/fckuploads/file/76061201578.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/281f1aafc2dcef948e5ff49583d76e2f/mabuvebugejakisoki.pdf
    • http://bulmarconsult.com/files/43142459394.pdf
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/feruzolisexuninekuvuve.pdf
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/fegixegunake.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=wind+river+full+movie+online
    • 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_off0000abde.bin
592c4067893b632b2a3a9aba9c3ee7d4fb1bee910433a9bb9229610720cb4df3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABDE 10248 bytes
font_01_sfnt_off0000c2cc.bin
b65574d826ea7ca0ec7f8b4d753a5e8e9556d468dc2b4f8502413e703331bdc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CC 16524 bytes
font_02_sfnt_off0000ecec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 16792 bytes

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