Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb463851ba1247b…

MALICIOUS

PDF

88.8 KB Created: 2021-07-20 01:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5df01f00d6838f546396471f4625a7f9 SHA-1: b8dcc978ee1120d9b2990bb292c6ca4f8e18d2a9 SHA-256: 0cb463851ba1247b78ae20e47b7adde46b5face86ddcb493ac44537a7bc276d6
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/xosovegewuwowobagigubul.pdf
    • https://premiersuli.hu/files/files/39034785601.pdf
    • https://bestcoloringpages.com/userfiles/file/61340693168.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/7eb76811e18acd8e153c7eb764368c7d/50656316093.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/6d083ad4246278e383124960a9016b77/37918412579.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9f681ae6---zoxexedirogepogila.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606e46107ebf9---kegitopi.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/9c93c7b67260d0d59aa97c5059172f2e/61110565005.pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/xadipuwosuxodad.pdf
    • http://ssujaxchapter.com/clients/83257/File/36767925098.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098baca1c0ad---24918896540.pdf
    • http://technology-mp.it/userfiles/files/gulebilibowala.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/4utl5jlk9058kkvnu9jp6a12in/41589772076.pdf
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/tqaic2cf9ikp6hjj6a84v4f067/wukeledoxemasarowun.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/6irl7smic4cdaq5btfm4itp5po/54587975433.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/6ca7388b7a5c44f15388e9f0065e4942/wutipafifuwipuzow.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99227f3dd2---sekege.pdf
    • https://unserbiokorb.ch/userfiles/file/mewotipajerox.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/c9dd4e3272fb5da4ad7bfefbede71771/situxozuletepedeb.pdf
    • http://willismctyeire.com/clients/c/cd/cd1fd5262213d36872a77bd42df049b7/File/9697865232.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/2vbh9gss5327cef3m1q9e8pip8/85034895135.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ee45eb502---vezakajejisomesojofiv.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/905670107609a068794601.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/7k7aduvstqj26ak6viaffqaafa/korotodojodimekunewav.pdf
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/58202791026.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=introduction+about+technology
    • 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_off0000f9d7.bin
711053d797310e7adedfb38110ce6fb829db8e586a672905d4053ed020726922
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 10788 bytes
font_01_sfnt_off00011265.bin
5d5717d1cddc6a41cb0131ccafe9db3bda094392ab4a377af7d130090b4c10e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11265 16752 bytes
font_02_sfnt_off00013df8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF8 16792 bytes