Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d643becfd6bc35…

MALICIOUS

PDF

94.0 KB Created: 2021-07-29 20:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 461823fa177f7946016a63d641b55677 SHA-1: fa977eb3b593caaf3d27890975c35a330d29f69c SHA-256: 45d643becfd6bc352ebd217c31da9e0576552d46d43f1594a61fbaba94577c46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs are present, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://medvor.ru/uplcv?utm_term=sap+hr+functional+specification+template.doc PDF link annotation
    • https://autoprofi.ua/userfiles/file/42326391413.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/8077223545.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160755b37054a0---zaxipogo.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f44267024c---tomexakogorepunaza.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607450444ea15---rorifubavogid.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/96609949162.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/wifonapufu.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/bodudujivefogizobexure.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/f3f83b02d1f006034ab4eb1b00ec41f1/73206843804.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/53906066282.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a92049d8185a8ff2d6e7e7c9b1186147/jinulezefezarafewotuz.pdfIn PDF document text
    • https://digireg.at/upload/56258550574.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/riwexofijipatun.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803040d9037---bagamobunovoviranovoxiti.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4f7b510f2---warikuvapimo.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/reduzejasexinokepusinolif.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/d4c6a6c4b135ea7d9c056f6241ae44ac/76289905511.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/f9qdhsgr7a5ihhkqa83u810702/9507839365.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a8521306810085d5598cacea04850e23/53685571813.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/51211996461.pdfIn PDF document text
    • https://laps.pl/userfiles/file/40416154742.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/muzebefodedita.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/tojaxiwukub.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/5i6ovi5s8l0d9n7frj022a0pra/fagitilinezepafanezipaziz.pdfIn PDF document text
    • http://innersolutions-uk.com/file/toxebelu.pdfIn PDF document text
    • http://hkalc.com/userfiles/35631607945.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_off0001097b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 11128 bytes
SHA-256: e4233e1ada4a01f3562f4b34349512735ca224421a40783a080dab643b821434
font_01_sfnt_off0001233b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233B 17680 bytes
SHA-256: f92b7a79403be691dd7ba2e9a8f0a2f71f6e9eeb3eea9996af14af5cbc893c7a
font_02_sfnt_off000150f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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