Malicious PDF — malware analysis report

Static analysis result for SHA-256 27cdf15ee5bbed52…

MALICIOUS

PDF

85.9 KB Created: 2021-09-21 03:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f0f01a777adc6aa6ac5c002dd8abbe71 SHA-1: d5c725db9f8d0b58e33f64f2cd170ddad95f01ad SHA-256: 27cdf15ee5bbed522e28d4b8f650b64a2e28ea5350e58daec19e57deef104f9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_21_08_03_13_3805.pdf In PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/lijon.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/jonizorovanilero.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/mosilimunotuwewedu.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/42621366899.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/41472223930.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16149104c4b057---10012745191.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/64358632568.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/81293446563.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/zekiv.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/67005955519.pdfIn PDF document text
    • http://jobsmarttampabay.com/files/public/81947948318.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f03933d2fc---80102636479.pdfIn PDF document text
    • http://youil.org/userData/board/file/82683598469.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191975630575.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/nejaxamosorojijaxabek.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/lufejetabulezobab.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3f3015075cf7aab946414a2c7e8a720c/domepaxilofati.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/23664151085.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/94573000403.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/92787211950.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/ca96db661959d1cdca48556de92b4af2/xozejutofedijevejazufiz.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/bizejarizogebir.pdfIn PDF document text
    • https://fultoys.com/userfiles/mazasidavojizeditekik.pdfIn PDF document text
    • https://techsviewer.com/install-android-In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=android+x86+vmware+fusionPDF 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_off0000debb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBB 22408 bytes
SHA-256: a55f043bf8a6a706505a43108e25455f505fc89b8014bb5bfbabd92c909357b4
font_01_sfnt_off000116be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BE 11080 bytes
SHA-256: bac172cb357a353bfeb9bca6e0bb650fb170589bd7e84fb7ab25aa42dc450e5a
font_02_sfnt_off000130b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1