Malicious PDF — malware analysis report

Static analysis result for SHA-256 7683f9bcdb5e90c0…

MALICIOUS

PDF

84.0 KB Created: 2021-09-10 02:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 37bad9806aec341be79fbcc8c99a34b5 SHA-1: 7647d66c97c32012a8c7ecbe0b6e34ae38f6b9d4 SHA-256: 7683f9bcdb5e90c0fcdf57715bce28d38e9d4139f1939418bc33613e027b358d
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, and heuristics indicate it functions as a link farm pointing to various PDF files, some hosted on compromised CMS uploads. The critical 'SE_SECRET_RECOVERY_LURE' heuristic strongly suggests the document's purpose is to trick users into revealing sensitive recovery information. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or social engineering attack vector, likely intended to lead to credential theft or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://geoodwierty.pl/files/file/dalilujosawem.pdf In PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/11435977219.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210904235241.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/52123824361.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a93dd17405---busejelev.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/26929560295.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/dufenamonakuti.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388b619fdbc---25199052235.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/vitomavox.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/95486166586.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/00c6cf4c047adfe95001f27faf7fd1b5/levujixeka.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/49274008890.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/vazaxin.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/f7s0a3e79fkcvft9o39pfg3h4l/25927288606.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/viputewosumipabixamel.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/godewamuparu.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/gg03gv3g2a12pqnj0qe2c30uup/zozupogowavafuxor.pdfIn PDF document text
    • http://prestopc.it/upload/file/tinabivedavabivado.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f039accfa3---riselax.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/vigibizilodozezez.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/vizetupofiso.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/taxezomesekip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=download+hi+launcherPDF 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_off0000e254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE254 10388 bytes
SHA-256: 6956ad92d7f2083b8f3541cfdedca7a89894d1dd1867bd1aea378011c547e207
font_01_sfnt_off0000f9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D2 18640 bytes
SHA-256: b9cf3334d92f1246b71339aca0726ef13e184081b1c000d624171024e1c05139

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