Malicious PDF — malware analysis report

Static analysis result for SHA-256 240c505d9e26dec5…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 07:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f475cddd7eb5759d8ea0d991537ca00b SHA-1: ee1ccc39a817c781942486af481de916357998eb SHA-256: 240c505d9e26dec5e5aa856a6dfa14fe717af03cc41eae094690586f02ebfe45
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. Heuristics indicate it functions as a link farm, pointing to multiple potentially compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of JavaScript implies an active exploitation attempt within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://zbirozskepodzamci.cz/userfiles/vulixetafuvo.pdf In PDF document text
    • http://balone.net/_upload/file///vexadevosatazunu.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/parivisopawerifi.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/fesofera.pdfIn PDF document text
    • http://asqcert.net/files/files/90683031450.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/46708987172.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/dc5318f0020f39bb96ac3f6d36128501/rajemigadijozujezebi.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210917044345_gy5at7.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/622de061f7020bcdb60ac1e892c4cc53/53126224281.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/wepixodetonunozutab.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae8c51f404---nidegegeripalukad.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/55641072705.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/77719019474.pdfIn PDF document text
    • https://breedlife.com/upload/files/rudajiguze.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/nurag.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/lulibegaso.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/goluwuvobikibotorun.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/74108128699.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/63891867387.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/wepixorurefurokizikaw.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/pabexuvafuzugofogekurol.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/32efd151a87393141549bb07db274ba2/filuviwamuge.pdfIn PDF document text
    • https://matricula.arendic.cl/files/lewenasizupedu.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/86095846673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ramayan+pdf+in+gujaratiPDF 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_off0000ba3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3A 16700 bytes
SHA-256: 02f9d29caac0fd2c43ef04bac2a085439a6ae37d514c6680c5c056f1223b842f
font_01_sfnt_off0000e519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE519 10764 bytes
SHA-256: d5c82156659b2426ab0c42e0ed2f026a70fb1202020fa77ef41d1fa1cb37b0a6
font_02_sfnt_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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