Malicious PDF — malware analysis report

Static analysis result for SHA-256 07ff1753283ef391…

MALICIOUS

PDF

68.1 KB Created: 2021-09-26 00:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e06d147e544c6e5bdf2a77a828a7e54 SHA-1: f1ce0fe388aa997d0b17b7f56be2ddeea2bc6cfd SHA-256: 07ff1753283ef3919b00765018933e35aa469ae43fd148e3902e04afdbeaadc4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://cructi.ru/uplcv?utm_term=joker+win+123 PDF link annotation
    • http://hzzxtl.com/UploadFile/file/20210918101458719.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/mameguvurowujuzijijez.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16145fdf21c341---87827245668.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/46101368470.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/30230337698.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/32543394621.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/rutujaduz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c5f41516df---58721572591.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/kalar.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/denasosasopure.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/94222145104.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/94036139411.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/9881471309.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8b1231876---revaxadozev.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/bovezijefilamara.pdfIn PDF document text
    • http://goldengatetaichiqigong.com/userfiles/file/1867822535.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/pajejawowe.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2f2dbf63a---77448057456.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/mojafutudib.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f78d99ca61---31848689308.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/48859944979.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/61521849651.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_off0000ac6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC6F 15264 bytes
SHA-256: b81fc1bdf7c955f939de1c5a9eb142b81548d5afba18e35c6e4241a686259d2c
font_01_sfnt_off0000d2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F8 10140 bytes
SHA-256: 8a57499f1bc57622dc7584ac114654734ebbf3a6a13db886df644414602fc59e
font_02_sfnt_off0000e9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1