Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9899327a74ec88…

MALICIOUS

PDF

80.0 KB Created: 2021-09-02 02:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2c09f581126b64694209537a09e73748 SHA-1: fb558e36ac32e65fdf1d0014c7668d3e904d9391 SHA-256: 5a9899327a74ec88e9bb4373bfbffcb6569e39df3273763b040bc03afea9b646
176 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal malformed streams and a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting the PDF acts as a lure to malicious sites. The embedded URLs, such as http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875e276ebca---narewupajiv.pdf, are likely used to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/82632093502b5df30ee3b860588e6719/xurojujapapifajireb.pdf In PDF document text
    • http://vonschickenfremont.com/uploads/files/28646744675.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/62469249568.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/23650113522.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/53120140812.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/50310117891.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa12b7f03f---43336114638.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5e3b5606a7d4ff4de2bb40cea3ee68fa/xedupugefodixetuleja.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875e276ebca---narewupajiv.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b16c1428071---21159217703.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3d835eac87b0a6582f80e57d8eea8948/84592207773.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ltoog39sij6pb26k0o14u0bjq1/womako.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/ajieaivpb9q3oib6dfe6fmsirv/228925835.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a073de7426f---pagugin.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/74978831037.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160883fe56304f---totovukadejafafedivebukuj.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/9bfe16526b50cfaf737e49bafbbdf3fb/zetetudowogezuvudani.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/2505907517.pdfIn PDF document text
    • http://com123.vn/uploads/file/zakiwarixilavo.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/52875124139.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/67526632061.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ap2h6sg92k49f0m2gggvpi67m6/rarelinuno.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/kataloduluvujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bold+visions+a+digital+painting+bible+pdfPDF 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_off0000d254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 10832 bytes
SHA-256: 70f7e7290f13cfaa84a7762f29d00bba6919d30d43ae3de407ef09959e0f6ff8
font_02_sfnt_off00010324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 17100 bytes
SHA-256: 6a419d79f544d4bca22e01f3d104db24132a0717edf2764b37cacc123011bed6

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