Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e0a2f8490a1eaab…

MALICIOUS

PDF

90.1 KB Created: 2021-07-03 07:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 766ecc212b76ff7554e69fb76f213ab6 SHA-1: 663ef559d09daee9032ffd4e2a20f6c6fda51e3a SHA-256: 5e0a2f8490a1eaab11e904adf77244123393e3ffba530f52b6946f515e02a8c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is part of a link farm designed to exploit search engine optimization or leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://oniceh.ru/uplcv?utm_term=in+what+month+is+the+new+president+inaugurated PDF link annotation
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608aea15d760b---dorike.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/dululo.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/xidakekobufafumekuxuk.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aecef75980c---nizukigogipixubimarex.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e0f263a3e---44951653351.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/gezuxigawefijuxugi.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/mutavibegumibivoxusevinub.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d3eb4628e---mozepomawinesida.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/6f2766a1216ca2fdf97c5ee243db8cf2/vorenemupivojurorurabo.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/61105293501.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072dc48503c4---84100604226.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/591348802.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c0564ed77---gimez.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d49ac98f3---99467714773.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/kuzidob.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acceb939330---9571083585.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/81184969336.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160adb6f8ca8da---73457317712.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/jixiganapoguboger.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/22b27623da2940bf20a2c77d245e43c9/29038999980.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc444d4c1fe---vadinopo.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/vofitaladexufevozik.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/jekawuragojonaxojibawa.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_off0000fc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC26 17468 bytes
SHA-256: ae01dc8ed0b8ca4bd1a76e27ae7deb218ef1b0d2647a31ba4e0bd848b799a2f5
font_01_sfnt_off000129c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C9 10932 bytes
SHA-256: 38623ae3d3b4e2ae1e6633631bfa6928a36f14702c2f8f09ec91a6313b1fb8c7
font_02_sfnt_off000142c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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