Malicious PDF — malware analysis report

Static analysis result for SHA-256 a799400bada2757a…

MALICIOUS

PDF

69.7 KB Created: 2021-09-14 02:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 74b39125daca2af6b22beaa904e2f888 SHA-1: a2720da0458aeedab95854140514cd05628b4dd0 SHA-256: a799400bada2757a534c88a72104b48c989b4fb60838167ba0ec263e85d67fb3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the nature of the embedded URLs and the PDF structure points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://greenbins.ca/ckfinder/userfiles/files/famusonifelag.pdf In PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/3jt3p1nj3uqqbga6e20bpi6e8h/buzefarijujomoludif.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/17673530800.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/3559431355.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f32b41d935---rerojozubigufisud.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16131971781de7---napusanejilufifisoxu.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/2982011552.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/96397117177.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/wozetuluvaki.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/86975993002.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/bh3pn4r2g55kl5f2mkdqm74iab/tunikuzanisefubofotegi.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/labamejiwavexijuxo.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/23354267398.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/vejezifoz.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/61673220349.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/jekegovuvukejom.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/81178331947.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/58292098792.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/senakebepisigemurunigofi.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/refiwewesavemile.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/mamasozowedebipigunugupas.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/66165356083.pdfIn PDF document text
    • http://zaiger.ru/img/file/65194862940.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bee30a1198---laxigugimuxigumamasogi.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/96948545633.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/velobobelupu.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/21582481561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bruno+mars+count+on+me+tabPDF 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_off0000b45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6D 14532 bytes
SHA-256: 01268e7c0cfebff96ab63441d6092feda66d81c9d4cd4f5481c336723a0b8908
font_02_sfnt_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 10548 bytes
SHA-256: 248c8b1bc7737887b08af5516509fbc5e00ddbf75676e68650e8520268e79fba

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