Malicious PDF — malware analysis report

Static analysis result for SHA-256 f60c5a1c72215b26…

MALICIOUS

PDF

81.4 KB Created: 2021-08-09 14:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0becfe4efb5672707b3655f9fcf57d19 SHA-1: c6c6084846a74b79a7075eb3ea5b189d94f016e5 SHA-256: f60c5a1c72215b265aae0b16118e2c319be441a4dc35a97acb3b50785e5fa0b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://vayamcs.com/content_files/files/3098549771.pdf In PDF document text
    • http://huucodatlanh.com/userfiles/file/41841572909.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/tuzazonokaxukewitovidobub.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/disudedurovarof.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/zupitusuz.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e952216465f---17183648423.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/22dc8013836253a83e3206924888a622/mivofokofilugu.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/24881908499.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c448f7b1ade---dapugodupeguniza.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b74a529c2---2948008822.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/fularov.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/bulisolidetiboled.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2987813eb---84652223683.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/fd66a1114b527b6f5eaa069e4d503e6d/juxapasatad.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/xevaxilu.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/1a4731029eccb28ac24c70460b82c11e/58536028336.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/56523871877.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/39369470541.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/rexopuxosutititij.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/kagukofazi.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/roxita.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/kd179mjavftg8ufj80oeegqeah/46133950555.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/65198462403.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/sozujiwubiwojigutir.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/wozudoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=eagle+point+neighborhood+birmingham+alPDF 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_off0000d7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F7 17548 bytes
SHA-256: a75c1f3a6900eb1cd24c9c6dcfe679064e3e05d5d04559a941dc96a912073cf3
font_01_sfnt_off0001068b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA2 10792 bytes
SHA-256: b6517d2b7c08be2f6dd298307037657166ab92ceaf75205e494afb939d159865