Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7b55fee06f89e4…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 11:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 121935ab0b28650a7903bb07b636e67a SHA-1: add1e375a91a790b98a80fe3de06ee3b9f6e8c0c SHA-256: fe7b55fee06f89e4c5082d2c236461b88747ddf71829ba123f51fcef393564a3
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised CMS upload storage and disposable hosting. Heuristics indicate a QR code lure and a password-protected archive lure, suggesting the document is designed to trick the user into downloading a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crysiq.ru/uplcv?utm_term=scan+qr+code+picture+online PDF link annotation
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b846528b18---rolox.pdfIn PDF document text
    • http://contua.org/userfiles/file/43726506121.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/38547597124.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/jubamiwosidinabefeloga.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/39244817872.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/1797734798.pdfIn PDF document text
    • https://digireg.pl/upload/31488779836.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/lasibawepekisijewap.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/93601495753.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b09064e33---12077920039.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/49643997489.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/12391831732.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/62075191161.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/38964822432.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/79208539299.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/tafefuzanukixixelogiberir.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/zapaso.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/40885433594.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/lh54p9t6rvi1dieg5u98m56a10/98054546644.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/dudonuke.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/xodomiwevolopufogagajutol.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/80524e2508f09354ad3738fb9887e82f/zatatubagitajanopij.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/kemofutatojozu.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_off0000d9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A2 17480 bytes
SHA-256: 5f691a84c4ac9e1d5626c7d9fadd4239d259853ec5fe0227e5b6aff5215566b5
font_01_sfnt_off000106fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F12 10660 bytes
SHA-256: 0ce603ae6018191962efeb474b6ddfbebb07ff40d8bcc565a1d88af16e242cbc

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