Malicious PDF — malware analysis report

Static analysis result for SHA-256 3187e8fb8ec3ec87…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 19:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c16ab3720d83687d8c60da342b447983 SHA-1: a2ce112b4d829cfb2a8b3a4d8ec525c22198a350 SHA-256: 3187e8fb8ec3ec876d88aa56335d7c71e022bcdd963aef68ed6491b62ad88a07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://brandiassociati.it/userfiles/file/karinigikegususuki.pdf In PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c2abebea24fb2092ac9e9af62b80a618/pakixanufilixer.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/loxilorojuxofituzusurogu.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/12589133542.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/38466660527.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/faa3c6a1819f3d1aebffad2b61acf7fc/13743312264.pdfIn PDF document text
    • http://iwort.de/userfiles/file/ximanurem.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/moderogogodekilebenovu.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/ditutubub.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/pesofojolivimisup.pdfIn PDF document text
    • http://screen.by/images/file/5183368544.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/ragobupevoxugefaga.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/45520954364.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131710b6d666---98581643600.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614645421522b---wekizizaraveguxefunu.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/wuderilulukisizasomufaj.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/vezemirewoliloredifalagid.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/fedevaboziro.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/71461764456.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/velorixodij.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355166537ea---tolip.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/tijukezuzozulipebesosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=clean+master+windows+10+64+bitPDF 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_off0000b194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB194 11088 bytes
SHA-256: f30d335f5045858c97c733e5a1f65503eb473dcea9ec840f2d81302b620a2ee5
font_01_sfnt_off0000cb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB82 16368 bytes
SHA-256: b3f1650de992a8bf5515d98d914e665cee582751a95be532d7b3475b9ff618b1
font_02_sfnt_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1