Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd154bf9c85e5134…

MALICIOUS

PDF

88.2 KB Created: 2021-09-04 14:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 272ade596342987b010daff796d0ac54 SHA-1: cdb6512fff6107ff399b8203c15d2c47371b6322 SHA-256: cd154bf9c85e51343ba0cb5190ea6292599c92ab9fbfc60312f06d4209f10e47
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious links, which in turn host further malicious PDF files, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/oguu6c5fm6i826tqc9eagegc31/99801867069.pdf In PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/porupovomef.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/86237069743.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/43075129076.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/fojuvavosudilebotililivol.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f40798de1---50195606908.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3ad201b6f---mozoxiz.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/48321951800.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/lemeked.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/78bg93nrglv4huro2ag07frvg1/17341072413.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/64557852529.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/31458160451.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/jomadubuzobeliteledowo.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/778e3c77a97da9735efe4e19a8146365/jupitebizofuvexolifiziven.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/rimesabegagurepazufike.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/11552745014.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/35962562510.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad9073be55---52125815514.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/328fb2927ad74f7f3e191ba3434087ed/44379525236.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/94463450958.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/47650771323.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b1677959800---xenukegivupakesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=surya+puranam+in+telugu+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAA 10840 bytes
SHA-256: 897912cca6027a3ab8cafc6bf17e11847564912cba8a7444477a0f7c40ad7dcc
font_01_sfnt_off0000e479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE479 21524 bytes
SHA-256: b3fe4c344d0b90742adeb7fd798b9c6c4b4ce0928a0496a1dce7cb17aceb7ad2
font_02_sfnt_off00011c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C32 16060 bytes
SHA-256: 64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973
font_03_sfnt_off0001313e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313E 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8
font_04_sfnt_off000139f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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