Malicious PDF — malware analysis report

Static analysis result for SHA-256 411d874e298f4136…

MALICIOUS

PDF

86.8 KB Created: 2021-07-07 00:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: a39bbbb66ce5b32f0456ab49a8b6fc8f SHA-1: 72d521f54c16758df6a7e1a019fc460886d331e3 SHA-256: 411d874e298f4136c0a7c1b0a91a0ebb1e82b19090ec665dcf2bfa10d3581342
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised websites and potentially disposable hosting. The embedded URLs suggest an attempt to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03b9018e55---12309902925.pdf In PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/19fb85a8766a77ce46f2537732d9883a/penaborogebuziralomo.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/1620809575429.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/a5d7s96f4p1lm1t994va52jt2j/88041164769.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077506a99a6e---29882179830.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/moxobulokakimodonup.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/e4ef06eba5442cf131728a7c894ae6ef/24704299511.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/355cf2d74dbaae267463be1b5487f611/67623457120.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/50264142175.pdfIn PDF document text
    • https://dcimx.com/files/29007716527.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/2i18gpam25amtsbucf5cvfbg57/zedegefugujom.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210607020149.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dd234d736---sijotaxomodo.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/gakivokobugupoxofuk.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9471ae7d6c---nonezekogiwetal.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2df5713c83---kiweronizegolamu.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/54622268764.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/rurunizif.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afd3cf65df5---795368783.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/990s6k8peh7sjb86bv9k5pb2j2/36412210020.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab033494281---71830736343.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c90551066---waxelepeku.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/34499296616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=age+of+empires+ii+age+of+kings+downloadPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/napuvubevidaw.pdfIn PDF document text
    • 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_off0000ea50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA50 19508 bytes
SHA-256: 2b5342a7f20067283d7b2685faa094493014a9333de1a87727497acb50a38851
font_01_sfnt_off00011ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD1 10904 bytes
SHA-256: 8924b5bd696c5d0d76cab17f9ce07cecda58e5a04449858cf42379dfbaa1b40f
font_02_sfnt_off000133dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1