Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d556d38068cf4e…

MALICIOUS

PDF

76.8 KB Created: 2021-09-19 07:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f443d4ec2dccf1d4853d57088af44c8 SHA-1: 7ec7c3763fb599eabc2df1f4d01786f218f7c0d1 SHA-256: a2d556d38068cf4ef268a426726fc3f6f9140ca1584a56d9ce66f576b243c400
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to improve search engine ranking for malicious content or to distribute phishing lures. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=how+to+get+free+robux+without+doing+nothing PDF link annotation
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/4387318205.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/98160800400.pdfIn PDF document text
    • http://raczcsalad.hu/files/62938224127.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/50490791282.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/denelofisutijujar.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/joponofemiribawana.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/medikiwezub.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/12029102443.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/wutebovotubajulawi.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161314429e99c0---duzufovasuga.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/24714386863.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/88982494670.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613942d42a14a---4219100580.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/guvetazifasixavalutobike.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210903082148.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210918143422.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/66774243001.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210914_062201.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e0e26199e54607576d811e595d160775/19180372863.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/10792570928.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/32488022578.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/finewobekoxujapuku.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/30025717391.pdfIn PDF document text
    • 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_off0000c612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC612 10676 bytes
SHA-256: 8d5b5357fb3aa136b1a3119d4d4aa89ea50e7d547f5c3d2ee62db019dfa2fdca
font_01_sfnt_off0000de49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65B 18124 bytes
SHA-256: 0b41ed78a5739da655f2d5127d19c6701e61795e92b965d030524d06ab38087a

Open this report in the interactive analyzer, or submit your own file for analysis.