Malicious PDF — malware analysis report

Static analysis result for SHA-256 753e477e5c08385a…

MALICIOUS

PDF

77.5 KB Created: 2021-09-04 16:38:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b46f4e28f64d604372568ea482c621a8 SHA-1: 98cb8c33a8b4d618f05f0915917dd77e062dbb69 SHA-256: 753e477e5c08385abc0c33ed9d11f3419e2b7cc9cd83989f7288d61b5675b664
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 ClamAV and an ML classifier, indicating it likely serves as a phishing lure. The document contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute further malicious content or redirect users to phishing pages. The presence of numerous external URIs and link farms strongly supports a phishing or malicious content distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yucehukuk.com/resimler/files/71402505475.pdf In PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adeef6fa75---kizotumijam.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/61791906074.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/0b513e56adee2045f0b2a8d1708b6263/42020149745.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ke3uja5v2cnh0pr9g8353espmh/vixajebofufugiwu.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/27b40026bb9ffae3820be25a87437b5f/munozulejigalavakozutun.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/64880002464.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/42966285651.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/6ec457f912e8b342a58b983867a4e459/tidozirop.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161249596362ad---6942456136.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/16038699975.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/karomuj.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/zadiwuxariluxekofexavix.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/55541719172.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/69918979109.pdfIn PDF document text
    • http://vo23.ru/upload/file/texata.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/31224117390.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cc7a1775c---fibada.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/fufewevonetilanewofogini.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55be41f43b---jamili.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f927b90b25---92851108052.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/goralisi.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/lariwuniz.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/14442127233.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/vedemufe.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7f5cf2adb3203a1170716ef1986e7bf2/sarisumubaravijamevimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=rodalies+renfe+r11+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6d044ed7060fbfce32706e4f03c3a623/7319692265.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C9 10488 bytes
SHA-256: e168b57a024078d70c2990881092c7597b1be846793d082bb6098dc26fbeb23a
font_01_sfnt_off0000e1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 18140 bytes
SHA-256: c3dc49a3c51e6277600d7c64ba3f311793878dcd39d41deed1e806b4f3837155
font_02_sfnt_off00010fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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