Malicious PDF — malware analysis report

Static analysis result for SHA-256 b510a34069199efd…

MALICIOUS

PDF

85.5 KB Created: 2021-09-05 21:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 82ccd9b7d13099a5631e5db1d3045ffc SHA-1: 3a6691fef456445dbff8723cebdf5c69fc80cfe0 SHA-256: b510a34069199efd6a8e701edeb6d1a4e960fdf30081ea111e55453ef41863a2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and heuristics point to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://artbynela.com/uploads/file/16552310525.pdf In PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/th1u8i1iotgc8sefjtbblmgm37/donikefiroditibalowak.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/vodof.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/20440264463.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads//files/202108111605508047.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/jedameposedu.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/xajanipiferalojetev.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/88660414883.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/90255094572.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/11665445630.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/kosel.pdfIn PDF document text
    • http://meyras-tourisme.com/ressource/site-image/files/zafijesep.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/0ida89qnc7ss5vb1un1h62vdd4/58789478310.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/gebaxepuvosefikexuladaru.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/62120403712.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/60754909586.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/24449259706.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/68401835802.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/litedamelumebolizapoka.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/papumusobev.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/56783881327.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/mepuposozowipo.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/ac61015befc597ceaf4ac83fbee7ff1d/nesofupozuloduler.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/79378838632.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af9e5a4de5b---zezakosufawiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=lsat+logic+games+practice+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_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 17992 bytes
SHA-256: c7355008d9c645eb18a47be727c238c805ca2cc718b75ea8ecf745fc0a74647d
font_01_sfnt_off000117b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B2 10816 bytes
SHA-256: 2065c5cd6f3006ed44e3284bdf2ef9dcb095dd39ca176aa1aa2bc020d8acea9e
font_02_sfnt_off00013075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1