Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac0b1928a263aec…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 19:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd6e2ec4c4b5bbaf45c8444c7496722e SHA-1: 74f1608d2eca3812bf5950967191a3c8f0cb6443 SHA-256: 1ac0b1928a263aec7062a070bc2dc2f882f279329499dc918dc761e613a6ad87
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely for phishing or distributing further malware. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613abd8561177---zuledobosorivosana.pdf In PDF document text
    • http://slkuang.com/v15/Upload/file/202191151487513.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/kanubov.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/posoxotaxunutixuz.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/37798517035.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/51600415066.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zejamejutu.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/65764417967.pdfIn PDF document text
    • https://kawanmto.org/contents/files/39126421272.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/2716842839.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/57120442058.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/kavupevejajat.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/a1f83a7f62c5991d5ede66aa414fbbeb/87194272262.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbe0318359---93987471890.pdfIn PDF document text
    • http://marine-inox.com/i/File/61985478877.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/84646744174.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/lisaxikenezadiwunimawo.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67204119228.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/golasiwilafolup.pdfIn PDF document text
    • https://masukpt1.com/contents/files/xozotefebevesatigagosa.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/leraxenokegopeweza.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/26554573357.pdfIn PDF document text
    • https://clubon.top/uploads/files/lakeme.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130222484290---2788583248.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/5448425426.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/64032091741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=minecraft+apk+6PDF 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_off0000dc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 17912 bytes
SHA-256: 95e4af83e56bcacdccf9a8d8a877c5eb47e83afd956b1db6951da1b0518694f9
font_02_sfnt_off00012328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12328 10392 bytes
SHA-256: 24a2891a3cceb2057b6c5434e625f4e62e63a6fd4ccdb6c8842930e6aff71746