Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc65e80a54309b65…

MALICIOUS

PDF

69.9 KB Created: 2021-09-16 23:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8ba5dfa8554f3c94b6eecf30a474ede3 SHA-1: f0860cac2544b2485ea1c88028375778e3187cbb SHA-256: bc65e80a54309b65cd321d9987cbf9a6cb52d7d1f1c64742ed65ff04255f86cb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically indicating phishing and trojan characteristics. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to host and distribute malicious content. The ML classifier also strongly indicated maliciousness. The presence of embedded URLs and the nature of the heuristics point towards an attempt to lure users to malicious sites, likely for credential harvesting or further malware infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161341f8f03298---55619146969.pdf In PDF document text
    • http://tythb.com/uploadfile/files/28152513525.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8a316ee0a---giliv.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/somuwo.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613044780d31c---17565352618.pdfIn PDF document text
    • http://texmet.pl/userimages/file/35860410998.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/9eda462d8f98c3c098c4f9920baff4af/pagasemafekuxuvafa.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/80578497346.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/29425680513.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/83628158235.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/samomagurimasupesiri.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210908182700.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/99870631985.pdfIn PDF document text
    • http://pvvc.cz/files/16217821067.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/xavuwenowodoreleve.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/28991486988.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/15930659589.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/20576507125.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/mipiweja.pdfIn PDF document text
    • http://446888.top/userfiles/file/fafopusabeja.pdfIn PDF document text
    • http://oilspecchem.com/files/senutub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=wwe+immortals+2020PDF 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_off0000b30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1C 15592 bytes
SHA-256: 8233c3f32dc4754ea70b2395c2f637bbf7f4eec713682c54940923af73bbd4e2
font_02_sfnt_off0000f2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BE 10484 bytes
SHA-256: de3487de9f7da64a4362cc698cb98a1c5b59cb9423e59bd144178ff7a01c616e

Open this report in the interactive analyzer, or submit your own file for analysis.