Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8735ce69c45c4b…

MALICIOUS

PDF

75.3 KB Created: 2021-06-06 20:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d7bb79c7a5637782ddeb5d9f9fb3421 SHA-1: 7e34cba8a418b29163509cd06a52e042956387a0 SHA-256: 9e8735ce69c45c4b8eb1d771b8f16af5af86390872f94d181f14790718569156
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate that the document is likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://smidgel.ru/uplcv?utm_term=eugene+petit+derecho+romano+pdf+gratis
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/3jeq39inlbff8iiqkqkgglt1ji/32621106006.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a5095b65d---20093579207.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/1c24750de214d37f22639b5190d508fe/nedanexibo.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/c6416cee4aafed08fa104b9262dd797d/luvusozesobaxaw.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160704836adda7---nopekabuxizuguna.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f2c4864bc---36815961465.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58dfc08aff---jemujafi.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/288f35b860cc8edf25028f8014c12604/nofewawilexi.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/56ad8ca8b2bb692141f6a5755328ea8c/tebumefodokoxowowogujug.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/46b5789ebf74fe280f9dc3c219d654be/96514831948.pdf
    • http://feach.ie/images/uploads/file/29134667497.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0ba96059c---93846849173.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f06c1b42565ceb04a85f413bf496b342/69685932717.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f2dae553c---86461615920.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a18a683c337---26381415922.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://janyska.home.pl/_mjanyska2013/fotki/file/zijefexamevopogozotalon.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b4.bin
480b4e03b32fc2c7a6051efe45e62e77886345b80a6c8b30eb37d539876598f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B4 5496 bytes
font_01_sfnt_off0000f83f.bin
27c6272ae19f9aead9c91f54e5b5d245874bef98812bc81010b4e15b4f4fac23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 12384 bytes

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