Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a38443c7697069…

MALICIOUS

PDF

80.8 KB Created: 2021-06-29 15:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b1a9913219a7a8d28aead665112656e7 SHA-1: a7b4cd11e3cc450875e82ac93b4e373140df7b96 SHA-256: b5a38443c769706956cc8fd1577bf2b4cfe0ec83a62b69e1900d870e274108ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=mbbs+second+year+books+pdf PDF link annotation
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/38720870704.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/50267438516.pdfIn PDF document text
    • http://vodnik48.ru/content/file/konunetinolobaxetun.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9cb98bc4d---zenidekiwolujasepe.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/0a70917c3cf6da9a92d486732ee61e59/nuvedugilexidutotojiparot.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608bac15025f0---82240326560.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-5/20210505131928668853.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/a997c54739386a99c858187c81f3234c/fizonono.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/xuwuzevoxikolewufita.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c315d7096---gavisinawitizevemi.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/51603801738.pdfIn PDF document text
    • http://mabuksusu.com/contents//files/10532738769.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc99767111---ninamisaluvukajuremo.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/f5pcudnpf9m6r9in7e1nq32c3s/laxisusesa.pdfIn PDF document text
    • http://hyderabadibiryanicorner.com/admin/images/file/kunupuv.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/juxanite.pdfIn PDF document text
    • http://anadarkogomezfamily.com/clients/7/76/76920377ef4e0cfe2c6e77079a05cbd4/File/77307616088.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/18332197163.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/c1a81ftd6hkb7m5ftp5nco3ldl/42781271133.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/95633453745.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/89560707755.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/7si3e7p6tal0ugqgsb18g3vf4s/16401753388.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/bajiloletufizavid.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaf044cf0d---37607261859.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_off0000d8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 17012 bytes
SHA-256: 8e132b2142d2e26c9fdcf94f812250359cd0999e8797e161da7538c8d357379c
font_02_sfnt_off00011d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4B 10716 bytes
SHA-256: ba9803e463eb3a320f010e7616fd5d3946b1710a0b22512d8ea74213ab2b4ff6

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