Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3b37082ff0ad64…

MALICIOUS

PDF

73.0 KB Created: 2021-09-03 06:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31f89983c69834181b6438fc488c5a2e SHA-1: 3d2b9e5de06ca4e901da13fd55132224bb13614e SHA-256: 9e3b37082ff0ad64fbb4166b4430dc5fa9a88044ab17749ebbe1dcd9c5514fb9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the structure and URL patterns are indicative of a malicious PDF designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://akcjonariusz.com/UserFiles/file/67616513043.pdf In PDF document text
    • http://bukhatirhomes.com/userfiles/file/kukapiwef.pdfIn PDF document text
    • https://datajournonepal.org/files/23229278885.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/bizidiratidokelunafekedag.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7bpblh1702tv1nn817pk0k0fl1/65390099221.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/292a10473e4163c6ccf5c85709246a81/tateporateboberudiwelere.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/74374226776.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202106270003509176.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92cae6eda---faxopebifi.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/pifaxisox.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202108/file/210809002515873788w63vw8xgzurd.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/wefigut.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/matuzoxa.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/lisow.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/vazukuf.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/83925104380.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076b997278e7---tekap.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/kojitososo.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/lemirenuk.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/17845839368.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/7478298488.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/jovopopebewoposidigemi.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/mafoxamol.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/92744043106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=general+electric+mini+fridge+manualPDF 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_off0000bb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB23 16488 bytes
SHA-256: 2ca545147826222bf7d63fe299801a9d599ee82d82f6409af04bd3c1487d9a51
font_01_sfnt_off0000e59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 10672 bytes
SHA-256: 5dc3e7ddee942eac5508c651394fca3900b1b17647b894e2edd603b7826cee7d