Malicious PDF — malware analysis report

Static analysis result for SHA-256 2023ae6410b50bdd…

MALICIOUS

PDF

84.9 KB Created: 2021-10-17 12:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e2636ff186b3186e6467ae180b4be6d0 SHA-1: d00bcbad75f23e8ce8b77eb529132e1449e512a9 SHA-256: 2023ae6410b50bdde648def8675e8e9124a7623b061ff006bf2629b4f8195486
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, including compromised WordPress sites and other unknown hosts, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/3589c4088cfc8401dacbfd9f8fc5f1f0/goxitezalimum.pdf In PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/podoxitimu.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/63502876783.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/26909858203.pdfIn PDF document text
    • https://arerp.kr/data/file///taxebobezoberopemufofafi.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/77943700942.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/91e2a8f095bfe98253c5359c98ee7aca/rukizonowopisagiso.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/23557899116.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/woxuj.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/42494904659.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/77780865820.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/20022981273.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/5nrtbeu2ta7hetmscccqf0hclk/vuzalupuf.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/56042664431.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/77690224043.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0009163001633337741.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/87809975166.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/kibijagupebevoki.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/7914781744.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/vivilefafifugejum.pdfIn PDF document text
    • http://lovesenergy.nl/file/dozix.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/65447970315.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/60863463266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/4dZi1sgP-vI/uplcv?utm_term=how+to+teleport+to+jungle+in+minecraftPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e225a389fdac4d628acb476ebd5b569b/gewobutavapedu.pdfIn PDF document text
    • 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_off0000e89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89D 10960 bytes
SHA-256: ac27f56a964aa28e39ade1d4082d97a01352c72a2d11ce401e3b9d880b88ad0f
font_01_sfnt_off00010204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A16 17200 bytes
SHA-256: 5d171ae66d7248da8594d96a525f6513fd8d5de051eadb83154a02ad2c15998c