Malicious PDF — malware analysis report

Static analysis result for SHA-256 da51dcf1ef8063f4…

MALICIOUS

PDF

73.1 KB Created: 2021-09-08 02:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e8f6509ffcda00a5870f57e4d728ba85 SHA-1: 4b1939c6256b61756f95f873b95ef7ecc3b69493 SHA-256: da51dcf1ef8063f47005f56bee55ad50c2365efdf76eda27ee6681293b85be79
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ahkjt.com/upfile/file/mutumabujuxudeja.pdf In PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/fe3060730f9548d9e95d7176a1e89efb/57912736406.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/43401606892.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/bizuk.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/38940526833.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120357e4952f---dedofelujoj.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/zetujosozotolugerusigewo.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/xumedenodalu.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/xuvado.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/32844738445.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/duguriwiziragurusogamu.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/17422561744.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/zoved.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/12157302778.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/fe501db05e98e2de9b8c1b97eb6dfe31/24205943223.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723969e4f80---33381733023.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/43473953735.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/81670714798.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/70574025165.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/roxul.pdfIn PDF document text
    • https://mollis.rs//files/divulejivadokifezup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=haryana+labour+registration+form+pdfPDF 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_off0000bc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC60 11188 bytes
SHA-256: bab762cb52773d5d39d79b3d426525898b573407c9a6064c954f35d1ac4b8f0b
font_01_sfnt_off0000d617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD617 16120 bytes
SHA-256: ece9b20231fbea08263ec959183dc61d2ff950bf7e693ee1b3263bf36d2ba94c
font_02_sfnt_off0000feb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1