Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ce7f19e4e32d1d1…

MALICIOUS

PDF

78.5 KB Created: 2021-08-16 05:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e0ecea4176fa6b2d40b0873330b5997a SHA-1: 8b19143b821b9eff330a08299b97d7268c29e012 SHA-256: 2ce7f19e4e32d1d1e62833cde7bfc6e4f82c5d20d80fc83161e9bc4307e36b38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories, suggesting a phishing or redirection scheme. The presence of a link farm on disposable hosting further supports this, as it is a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/4b1530df5cd54b8a1312b05935b3a964/lupidojisab.pdf In PDF document text
    • http://mcutech.net/upload/2021/06/file/1624533365601397908.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/e1191ae6301341ebbe205bd3091d8530/bedag.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/58787541483.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/xetusawakejagusijez.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/65a3de9cee312d1a6188cbba3e34c1b0/fikiloboje.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/mtubb1tp1usmrg7bj5dtubnkfj/33268492472.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/602859bd61a8ac892b37c9e2ec57d1ba/40204533640.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/luzidobepisupudu.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/fibevejavuxosatumaza.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/tomimoparuxugoso.pdfIn PDF document text
    • https://kamedia.vn/data/file/fonevosuvedowozezakupo.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/4002215591.pdfIn PDF document text
    • https://gilbertems.com/videos/file/xekup.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/69941648980.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/52463897828.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/97259134845.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/81tti9pkjo3m41ceiconsqqu0j/zuzogenorijojagibixaso.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d991690f63d---lujasilotusotaroxej.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/sagivujulubuno.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/vademarepoxatidezuvomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+hari+raya+idul+fitriPDF 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_off0000d20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20E 16568 bytes
SHA-256: 3f878c6c950b6df4a2b6fa8f48864d8941f05361abb464a1e27172e5da48414d
font_01_sfnt_off0000fd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD55 10304 bytes
SHA-256: bc0ed4fb21a6c00698a10c05210362da2e449dc975c7438ee7ffb9b2156a533c
font_02_sfnt_off000114ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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