Malicious PDF — malware analysis report

Static analysis result for SHA-256 966c35e4331e702e…

MALICIOUS

PDF

67.5 KB Created: 2021-09-11 21:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a362c1cb3b54d3b3d841018876488727 SHA-1: 110833e110fe87453d11c3d1a38b8b1d97dc3d00 SHA-256: 966c35e4331e702e23e8a2a3066cc5a4a86ac104b42758bdd0229d202675e335
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of link farm heuristics suggests the document's primary purpose is to redirect users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://crysiq.ru/uplcv?utm_term=laravel+send+html+email
    • http://birizgardenhotel.com/userfiles/file/xaduwivodup.pdf
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/pojibetewisovokutam.pdf
    • http://packturf.fr/files/83613314642.pdf
    • https://malashealthcare.com/userfiles/files/30610058073.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/af9ist3fsgjh6dut2rcsesit44/milajimujepezobutudagem.pdf
    • http://hongdanhaudio.com/luutru/files/61551175943.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16134a7dcb9ef2---63309044532.pdf
    • http://el-master.ru/userfiles/file/42188282351.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bf35c8ec5---324093292.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/f4544cf44633f6e89412c6f345cdf995/sironuwobalokog.pdf
    • http://proallprint.com/userfiles/files/26236162748.pdf
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/rabilafegomufedewo.pdf
    • https://lyubomiradineva.com/files/file/40270936541.pdf
    • https://kuni.ro/app/webroot/files/userfiles/files/sudafabikiso.pdf
    • http://dayou.tw/uploadpic/files/202109081658024812.pdf
    • http://chupanhnoithat.vn/upload/files/gafesuzewovudaxi.pdf
    • http://abaj.cz/UserFiles/File/ketidibenodakabodarojama.pdf
    • http://raffaelecavazzoni.com/userfiles/files/wivokitu.pdf
    • https://mkycc4.com/kycc4.com/userfiles/files/44543836894.pdf
    • http://toyotaquangninh.org/data/dulieu/files/mimipe.pdf
    • http://triple-a.co.th/ckfinder/userfiles/files/22462748213.pdf
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/povufogegerigige.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_off0000aecc.bin
2e50b543802a602d8a58dcafb195664c32a73dc33d804338df1724cc8226d39b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAECC 10416 bytes
font_01_sfnt_off0000c629.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC629 16792 bytes
font_02_sfnt_off0000de3b.bin
80b4a1fd98a583cc423c38a334d963c5411d0b4d465107d77475c69940cf9401		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3B 13996 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.