Malicious PDF — malware analysis report

Static analysis result for SHA-256 f902b8f2bc5837d4…

MALICIOUS

PDF

78.4 KB Created: 2021-11-12 03:35:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0473ce01af15ba2577277b6aae1d21b7 SHA-1: 0e958771d5c3043877187afe24d7050b9260624a SHA-256: f902b8f2bc5837d414a7accfa138865c5f18b52bb5ecd5bbba2e63d751130f6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to other PDF files hosted on various domains. Several of these domains are associated with compromised CMS uploads or appear to be disposable, suggesting an attempt to obscure the true destination or leverage potentially vulnerable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://unternehmensberatung-hegenbarth.de/userfiles/file/sinexobar.pdf In PDF document text
    • http://jor-agric-aqua.com/user_img/files/lozipetaxaxodaxute.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/49969578631.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16165d97f70220---sogexasopudu.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/743f890255001e37cfcafcf7ed83204b/biviwowuguledirixomexa.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b5ad89b13a---72556787118.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/87930692996.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/jetekuvefawomodazijafu.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/76320619899.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/fasiwuxexodogula.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/zawelozonumuvigona.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/nanafojeroxisovu.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/b23b06d5a49a2d5882256ce0c7e19ee9/rupowoxomeruketagarazomew.pdfIn PDF document text
    • https://www.nissan-utilitaires-melun.fr/ckfinder/userfiles/files/gexelifijomijibemifuriko.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/xazaledosedonabef.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/44b913af5ae14595668985ba91c6c070/17042165535.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/28928657491.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/wowexudozanex.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/kumeze.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/87113138172.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/48990024505.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/88838621188.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/58346544949.pdfIn PDF document text
    • http://falerisztika.hu/tmp/7747470144.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/4dZi1sgP-vI/uplcv?utm_term=the+gift+of+the+magi+synopsisPDF 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_off0000cf3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3E 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_01_sfnt_off0000e664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE664 10736 bytes
SHA-256: 46b1a36db5851b80f5ec60606ca89de3d2f610b78549abdd2bdf68236080fc35
font_02_sfnt_off0000fef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF7 17244 bytes
SHA-256: 5460094fdb18fe8c3381586e741ea9f31892680a66db9442d27f2d3ce4f64735

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