Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99a8be78a37c5d2…

MALICIOUS

PDF

74.5 KB Created: 2021-09-07 11:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fd612925994644ba51631b8d106256df SHA-1: 03bf2fcb8dd10b931557cd886a225b4b4c471223 SHA-256: b99a8be78a37c5d2abc08aa51f7f30c7003b5f2a4bd90d04f518014b91f9d013
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://infrive.ru/uplcv?utm_term=worksheets+preschool+%26+kindergarten+learning PDF link annotation
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eebd47da01---jejipijur.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/nekunemikutigoxibuso.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16091e12a8aa00---67398671684.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/mixizufitageg.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/bilesawujikawipete.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/37607509262.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210707161536453.pdfIn PDF document text
    • http://didula.ru/img/file/85960941073.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/84296235651.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/75054422347.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/62846781952.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/26856444388.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/pejuzidenenipogijagerikuv.pdfIn PDF document text
    • http://www.depomatrial.com/file/wodenujigawexasafataxu.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/zubegaxofadarobexa.pdfIn PDF document text
    • http://mtprospectbaptist.org/clients/7/74/74f10a8404da00fab064704771972c19/File/31023005030.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/662c532f4d82d2895abec6a61d2a3552/pomipuvitofa.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161289b962d682---46869824798.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/44844452097.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160971f4a3195b---lizulanijejogasege.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f351e60b2cc---63899747525.pdfIn PDF document text
    • http://boldogelet.hu/media/rajuvaki.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/64810069206.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_off0000bdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAA 19012 bytes
SHA-256: 638c489c04472eceb87234b42697b3674f50915647915431ead7182224d67fee
font_01_sfnt_off0000ed79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10590 10196 bytes
SHA-256: 4b87391f06ab5f6fd00eacb2d73f1b8a4dcbcf1e51a32522f82dc29eefd23d97

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