Malicious PDF — malware analysis report

Static analysis result for SHA-256 838684fe0d5d19fb…

MALICIOUS

PDF

102.9 KB Created: 2021-07-04 07:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 24ce375761c072db9854caa098a4f19f SHA-1: d3fc1ede11a0e2e493dd3ced1915e26f69de0022 SHA-256: 838684fe0d5d19fb1886d63834341582eb8931e0a90f9da78cf4ba3c3ca9a22b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits vulnerabilities or contains malicious links. The document functions as a link farm, directing users to multiple compromised WordPress upload directories and other unknown hosts, suggesting an attempt to lead users to malicious content or phishing sites. The presence of numerous external URIs and compromised CMS upload links points towards a phishing or exploit delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/vpchfclmdpaagk7gmdc181oqsu/vixaxalavegu.pdf In PDF document text
    • http://sxhk365.com/uploads/file///91020503163.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/42634617488.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/fa1296f98801109bced359cb99143f85/fematoriwanogarik.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/35701164362.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/24453267381.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/9e7c8e3a715a37c2955b6d185a573916/82529963330.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/38544453142.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/3bf59e28e80fbc8dec1d664ca62d0ee8/mozifo.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/dejuredijiw.pdfIn PDF document text
    • http://nova-auto.com/upload/divudarejimovepaletis.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d89f7055c8---12854226066.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/63789736239.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a072799c5f4---binizejuzexaxizej.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/gesowaninoz.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160872ea4d217e---wowuk.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/99707585980.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/xadutoviriwepifonalage.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a972cc98763---70663940174.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16089b0766d1ae---70413195997.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f02a44feea---1971903272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=three+cueing+systems+of+readingPDF 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_off00012f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F30 17908 bytes
SHA-256: 021a17f0ebe173987aa8338348bb851222aa77fe3924c3a077ece33b889241f6
font_01_sfnt_off00015d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D3A 11052 bytes
SHA-256: eb2452b913cd8211b19572c116e6c7c44f280ebf93453f255aed2743e7681190
font_02_sfnt_off000176a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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