Malicious PDF — malware analysis report

Static analysis result for SHA-256 c365584c6d94ed3a…

MALICIOUS

PDF

83.9 KB Created: 2021-07-01 14:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a02b79cdf46ae0a6c04ef613cec285c SHA-1: 6b8371cad44a4b7187615ff914dd025cf10fbbff SHA-256: c365584c6d94ed3af1619b4ceacd0a5576bdb24cf2fccb4408d0807ca8d7d886
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting, suggesting it's designed to redirect users to malicious content. The presence of numerous unknown URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3b9dd67e4---manedubazidasodavu.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d92059410b---felusaluzut.pdf
    • http://poorclarescork.ie/images/78238237718.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ae2c5d277---33105796768.pdf
    • http://ajivikafinance.com/userfiles/file/51945307779.pdf
    • http://eperon-kochersberg.com/img_db/51790685080.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac63be441---34578601412.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853ed90d4eb---suxonumamawemolewi.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/greciavf5lsvp6b7lupbiia84u/wupekexutut.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f139e2c3cc---vonuza.pdf
    • http://gourmethousemacau.com/UploadFilesfile///32922277985.pdf
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/31402044226.pdf
    • http://nebovsem.ru/app/webroot/files/files/bapuwifuwififimem.pdf
    • http://tunglamgarden.com/images/fck/file/3924090987.pdf
    • https://tramtron.vn/uploads/files/files/98586015304.pdf
    • http://amon-syotengai.com/userfiles/file/bafigusivitebi.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d57911dbbe---tamepomudu.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ecd8237ce---89991784640.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e24ff8029c03ad6d64b1611a257089a3/nowisofiromojufak.pdf
    • http://funperm.ru/content/file/67856359689.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607391cd07a3e---35518111615.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f4a6263c72e20e9539a32987e781c087/rodep.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5842039fdf---givinisubiviv.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=shear+and+moment+in+beams+problem+with+solution
    • 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_off0000e3b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B7 16792 bytes
font_01_sfnt_off0000fbc9.bin
6861c6929908894f5310003d27e4633aba6dba35475f3057af508aa70db99fce
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC9 17108 bytes
font_02_sfnt_off000128b2.bin
74c44656f40908ca8682e7913c6ca8ff0483acda298150035368ab5f20e85d52
pdf-font-stream PDF embedded font (sfnt) at offset 0x128B2 11056 bytes