Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ecbe8285faa6e61…

MALICIOUS

PDF

77.6 KB Created: 2021-09-13 16:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 556c5d5fb8ba847d96821253a944eeda SHA-1: 1bfb78b3d37bd8109b6a1f85e706611039238bff SHA-256: 8ecbe8285faa6e6122c64d1f41f556b6d718196d35e87d3a7e04b5450241969c
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/0hanf0f5o3bn3c47mqnlesoa6r/21199560671.pdf In PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/doxukiradawavu.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/72663075425.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/80936197284.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/fevufepalubixeferezaputav.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/esdnbo6dkn9jpud5e9iv8aoa1t/3316311288.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/85818063773.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/naweturezarijifadasa.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/sajibexewufof.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/sepufavisutetip.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/muziwowepufexixajogimo.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/79653655150.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/51993886369.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/15210872704.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/20227443404.pdfIn PDF document text
    • http://coffee33.ru/archive/file/dolazunipu.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/92271208173.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6f2e4f382---jadosav.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/813324281.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/zajilusebavasetof.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32332747477.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/26857624112.pdfIn PDF document text
    • http://orlickachata.cz/files/files/46934459851.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/47052992449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=writing+excel+macros+with+vba+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_off0000c760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC760 11452 bytes
SHA-256: a57f9f20948e08dd2931166dabc69637daa3e63331fadf5ac00325c3cd2cb073
font_01_sfnt_off0000e1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D9 18160 bytes
SHA-256: 4a0b16f2445aa0a0d599a3099e8962ed8b0ec5b493e78cd5cf8fb6a90070fc02
font_02_sfnt_off000110e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1