Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb56f7da6ba0233…

MALICIOUS

PDF

86.5 KB Created: 2021-09-06 09:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7e325630290ccd1f6f852a1d6bc7769a SHA-1: 3f9f031a554142260145a6b23c81927d407d263d SHA-256: 9eb56f7da6ba0233953666d7260544df8af89a2df15bc6341a315e7f7710ca6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/vkhpjmvphbk7tf21e15532qci8/bikulugelolesin.pdf In PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/1rcmk9msqd34u28h6v13qnka7l/26235257463.pdfIn PDF document text
    • http://kfbi.ru/content/file/91587630720.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/62128480070.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/5971703958.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a13b2f061bd---95271715308.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/javunivaromivakabuxan.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/56779812408.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2b74db72801a07f89e52bd37631b3c41/25928478473.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/49b8f7b79ef56d57f2a133c85ee9478a/miwuguvujemesiwidezeniveg.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ef43d7c77dd3b10c0e220e907474f41d/2466262575.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/88704493830.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/cc4692af2c804de3ebfbda243a099c86/zutupu.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/39986920539.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/35588831445.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210610141518.pdfIn PDF document text
    • http://innotack.com/userfiles/files/maruvinitubazuwexog.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/nemidinatevida.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/9sdfgdrrfrkgmra380n3rupbl4/28298258519.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610aef232e858---ropajetakewi.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/riraxefexudu.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/60578468681.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/4096499155.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8aa0d89ddf---sitetalebuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=livre+d%27histoire+de+l%27art+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_off0000eac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 19568 bytes
SHA-256: 364649ca70bdc8b17fcef324c1026b4dd5efeb607f6b9d97d5dfca0ccf998a55
font_02_sfnt_off0001338e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338E 10548 bytes
SHA-256: ca186e4013049b24c3eb2b4bc653d0f64586f356890e2a2f6c238350fadee2ff