Malicious PDF — malware analysis report

Static analysis result for SHA-256 3764b54b8f7156e3…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 02:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2c89cfcd8d0401a86c8d08e1bca59723 SHA-1: e50b1dd095011dcdb1c3c08f09ab00e96cb74146 SHA-256: 3764b54b8f7156e3caa32088d8a9cefb0fa0e1902f2d852b90d9e6dc6401e61d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fcfc34c8f---budewi.pdf In PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/17426691071.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/1188843507.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/28230982192.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/bupale.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/xibenipumizunemegamiz.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/romidukesaruve.pdfIn PDF document text
    • https://mkontakt.com/dat/file/xojupevadaxolabagomuj.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/vilinudanuromiride.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/63268952898.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/mojej.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/fagorapojesewagadojojor.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/83601749888.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/5d0b141f5761fd4c8d548ccd6167f73e/japuwuxeb.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/ralabilelanenik.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/xozomuviwiwisomawulos.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/38097260200.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161307e607c6d5---jesarivasuli.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/xowaninenuxojitakalujuve.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///xujuj.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16138e0793de0e---jobekegogiforivibubuw.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/todenuso.pdfIn PDF document text
    • http://hainfelderteich.at/saseguzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=film+maker+apk+for+pcPDF 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_off0000dd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 17732 bytes
SHA-256: 948e0f9d2391658bc6b16d3d5864b6981730a4a0c808b4f99c39f8553d75eb2d
font_02_sfnt_off000123b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B0 10340 bytes
SHA-256: dba2f9565ec55ff00996e47e5ff1b7fb7f593dc14fb5889a621865b79bb4baeb