Malicious PDF — malware analysis report

Static analysis result for SHA-256 eadaef56f65bd90c…

MALICIOUS

PDF

70.4 KB Created: 2021-09-11 02:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7c3f84f4f336edff1105c7f12a64d259 SHA-1: 20ddafff84d95b8aafa2d8e71a419e538e070579 SHA-256: eadaef56f65bd90c3c9b6bc984dbe79ed01cccdeebd09d062f9d970ae6d3049f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd9fb0ca4b---ruwefugad.pdf In PDF document text
    • https://jagominum.com/contents/files/losuvujigijezekezo.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/d42fa9fd5fa81f2be386db89631c7272/71120535465.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/romol.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/zuwabonexiniguvasuwukawov.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/79179017647.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/8499580283.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/58192095115.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/57132958876.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/20465743622.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/tidusivexelawituzena.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/92197853436.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be44f44040---fajovete.pdfIn PDF document text
    • http://speckrepej.com/upload/file/tejikisigokolanamorar.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/tegav.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/xonavivazojilif.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/e351f3171a0c3c7f335f71f8093a6ba6/kexerupaburejesusig.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/91371995697.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/jipuvapu.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/cc55108d71b158f1085e57e91a86a26a/lomegalipagubobimemun.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/pulodujamanevepe.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/lumapesoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=media+lounge+apk+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_off0000b4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE6 10628 bytes
SHA-256: b484a092d9d57fdc77e5a470782973caa2316e839c7409848f9bc9c2d0e8d9fe
font_02_sfnt_off0000e513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE513 15664 bytes
SHA-256: 46851d9ad025328f97cb13406c275a847df223e4d9d88edbe9a9b22f020aeea8

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