Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5e23d437a9bac0…

MALICIOUS

PDF

76.0 KB Created: 2021-09-24 01:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ef74da949d3ccc2ab051038e433b644 SHA-1: 35147bbdc69576bc07620fb0b53d8f1042be6605 SHA-256: 0b5e23d437a9bac045d8d5b877e6686d530cea2024d3bcb93a0b6516fb9d7ceb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting and are part of a link farm. This suggests an attempt to host malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/531a0f6086c123951bd9dd0b3883f514/rafilijuvidek.pdf In PDF document text
    • http://biogenetec.tw/image/files/20210913_165208.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/54005397374.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/17545195433.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/lobumixu.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/16800489522.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/gojixekopudewuki.pdfIn PDF document text
    • https://ubranni.com/uploader/files/razodosutuj.pdfIn PDF document text
    • http://salespate.com/userfiles/file/xasapobagegudevumale.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/xuzuzam.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/wikarigu.pdfIn PDF document text
    • http://lgassociates.in/uploads/luxisaxasapab.pdfIn PDF document text
    • https://isosklo.cz/uploads/39958396509.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/tiwawevaraxolalun.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/xomifugi.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/jarofaxefukizesusepogow.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315fb5276d8---71783839541.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f45464e87---83564373206.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/lorogasinenumogimofu.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/zogesepovoxonunawukit.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/vajod.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/soresovejimudebuse.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/75738468937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=call+of+duty+modern+warfare+download+utorrentPDF 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_off0000c124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD936 18732 bytes
SHA-256: 617caa9d3f0af6fc0e8ffe3bda70c23c11dbbc05a8980154e43928c67e01aaab
font_02_sfnt_off00010a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5B 10588 bytes
SHA-256: 5ede4b957611b8dd6c9788f35487167982d0afeaf2932298b716f19be4f5f867

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