Malicious PDF — malware analysis report

Static analysis result for SHA-256 8050e88d4a97c6ff…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 18:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cc9960c479636b56660758c294e46d6d SHA-1: ec75fa5a9084ec0ede26211fb2b1df142f4f2cc8 SHA-256: 8050e88d4a97c6ff4f13d6413773709abffaaaa1af0a426bf49fdcdfa8dfba63
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to external sites, some hosted on compromised CMS uploads or disposable domains. This suggests the document is designed to lure users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fields-on-earth.com/images/blog/file/61800754979.pdf In PDF document text
    • http://sbnjl.com/userfiles/files/xafeniwiti.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/37108265895.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/dadarexitogamedanezopi.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/47550969063.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/mijazofakipatuvexoruroma.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/bibasot.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c9bca36ba---18966972115.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367e0f0b3fe---75514994387.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/dokovew.pdfIn PDF document text
    • https://ka-base.no/images_students/files/52559928697.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/negak.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/43837275838.pdfIn PDF document text
    • http://chromavials.com/d/files/33143413208.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/45805455698.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/balojimugituboxu.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/7907527511.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/rotanufixafelabu.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135529b56f2f---62544198750.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/64825245739.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/35762334448.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/76672642160.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/23513069042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=v+movie+subtitles+downloadPDF 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_off0000e0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F6 17468 bytes
SHA-256: 1c17c0325c7da5e1764e262b1ffef7329b0551c32f024168c6740220a8950d18
font_01_sfnt_off00010e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001264c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264C 10668 bytes
SHA-256: 7756fe4a43b116c019a4ec8c99ac4f73954a365cf26d2ba811dc74b55b79a248

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