Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fdab8d04071bdea…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 13:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b7d43dffe800a12e94b580c9846db49 SHA-1: 805593593874201527c35b422d9ea96efbb064db SHA-256: 8fdab8d04071bdea0300e562cb4c193a6d1070eb5906a88c713d8de9bc363fb0
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis suggest the document's primary purpose is to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bwlpsalisbury.com/uploads/files/lojuxiguk.pdf In PDF document text
    • http://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/bolujiremunofifuvu.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/14549356493.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/ee8291a8cdfdf82fa344eabf7ca7b210/rubobivedokogubimela.pdfIn PDF document text
    • http://starlightcelebrates.com/clients/4/43/43e9139217482d7666ce300faf566241/File/zerelebololilagemipazik.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/mojuruta.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/49925327261.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/22233754840.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/16965811159.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097cf5eb2b85---74993250211.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/97072552297.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/sutok.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/rebujosuwazaxemi.pdfIn PDF document text
    • http://acril.ru/ufiles/files/tokex.pdfIn PDF document text
    • http://forti.in/userfiles/file/lakal.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/66858785262.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/47473926740.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae37697022---buvekumobofugekenu.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/86041709906.pdfIn PDF document text
    • http://irishvaughans.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/majen.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/xobodokunudopixovukusu.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/nikekifuputaz.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/927737810.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/mupexozeganajezope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=unmarked+crown+vic+lspdfr+elsPDF link annotation
    • 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_off0000de94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE94 10932 bytes
SHA-256: 99abb14b388444504d973c8e2afe11a2d357acf7c281dfedb82a6cea731c1cc9
font_01_sfnt_off0000f7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 17780 bytes
SHA-256: 3ceba9d2ddc2d952ea704ec6df6829b9668d576766a52585e8b233fe93b3c45b
font_02_sfnt_off00012599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1