Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca9754c65413be8…

MALICIOUS

PDF

91.6 KB Created: 2021-08-13 15:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2f1558a5fbadcb6d74db70436b5321db SHA-1: cbe8af934cf56c7cab0fba92857a658eb6b4ebd0 SHA-256: bca9754c65413be80df70613383956457be546eec93ca110e357ef82d5980d10
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs hosted on various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to malicious content or phishing pages through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://sun-green.nl/ckfinder/userfiles/files/48735951265.pdf In PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/rtbnfhfahg2kognslmqsq7qa17/xagifogimagezosadefiwez.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/c821103ff099898d44566444f95cb570/devofo.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/23qikgpv3bvv3sfs3b5d725q43/dulibakizuzewanitovujov.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/rerotuwajapejedigu.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2ebae986d---jaxumevaxevifewaxososi.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/daba98c605163ad66b8e5a52267950e3/rodiwadipolabe.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c76525db252ee5becce291a99eeb4f05/nikozabixeta.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c300c2c5ee8---63439323373.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/6914847473.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cec73e6dc46---54289684507.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/gitadib.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/61472146602.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160db52f6c2503---98585470911.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/20708766476.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752198b5615---50401712606.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/71e96b74773da77a2cdad721fc1592e7/60666824815.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076f957cfea4---55351394402.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/998b1412af998acaadbe1031fcde7154/xavomojazupapowibidak.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/acf2965b2aef6e8020070fc4e792ff0a/10115887440.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/zojuweri.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/4e1afcefe2e8308d0c554c0293949678/pudumupadujulamolinowine.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/lexigu.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/nezuzolapowagisibatus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=physical+chemistry+principles+and+applications+in+biological+sciences+5th+edition+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_off0000fba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA1 17528 bytes
SHA-256: 3d9525f7b86da891ecc01080249739dbf919a41d8102bab11e318c712d5f4ad6
font_01_sfnt_off000129ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14206 11456 bytes
SHA-256: 31f772ed8add02150f4a1df41fca52eff09c9bef7f7d7e9ebf59dc0b8d5cc82e