Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c8096527cf4ede…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 08:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5cdb0a02be92e0da32bf23bde4a61a23 SHA-1: 8614b4c7b36d0d6cec3d1f7570c51213bea96d7f SHA-256: 36c8096527cf4edeba359241c0825fe9c3f1e43de744d7534705d266dd18fe24
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting sites. The presence of these links suggests an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/7f35cb0ce7326f4b8e7205a4a83d2d96/tozasij.pdf In PDF document text
    • http://aklond.com/UploadFilesfile///2021050813564264.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/votogujitugalawivujurotud.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/jifepotezamegukuj.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/1c2a43cf07a7a3aa299e98ed4361bb45/10698850686.pdfIn PDF document text
    • http://safarang.com/basefile/files/lujavunamelaxuxokiveveg.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/gutigudodilasuxubuv.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/20061175644.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/93006781479.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/d4e0dac761d83e061a83bc3be4e38fad/34553094773.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608f912c9675a---lakatu.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/7aa173bda8a7b3251bfe34a09146c397/91232435781.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba38833d0cb---gemixiwoxotiwokudaxum.pdfIn PDF document text
    • https://unosms.us/userfiles/file/25814112067.pdfIn PDF document text
    • http://katachizu.com/img/news/files/83637231490.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/fdef27a57ec5c1949bd05a3369e34eb0/nopelazuwesopizudojaru.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/kadaboruzidatoladet.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/de6fff964c4e27cc213808a136d08398/92489375972.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/tizogixokape.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/jixaxezaworoze.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55fc519cd9---zorob.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/76010774176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=product+differentiation+strategies+journal+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_off0000dbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CE 18232 bytes
SHA-256: 2a039c4f86a07c20f0a17202ed9b606a05706a981f329ee740f9d138782c9e8c
font_02_sfnt_off00012343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12343 11024 bytes
SHA-256: 2f61d5986688cdbddaf8bde81658d98e4dfc9ef94bd82a36f7afc2c3088d0e9e

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