Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd620c3d07b93be9…

MALICIOUS

PDF

74.3 KB Created: 2021-09-09 22:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f9f12926827b4352fabf556cca4cc91 SHA-1: a3ec44722fefb484a91ed1e0a8b05e2fed54273e SHA-256: dd620c3d07b93be9a3b023f4cd0c403e5632c99e560683aeba608b95d31acc33
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to malicious sites. The high number of external URIs, including one pointing to a raw IP address and others hosted on compromised CMS platforms, suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://vinhthuan.vn/upload/files/26606710395.pdf In PDF document text
    • https://red-adlay.com/upload/files/12875700696.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/13086455849.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/33155053515.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/visojifenag.pdfIn PDF document text
    • http://aurora-c.jp/files/files/26246636280.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/755856114.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/lonix.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/51839250889.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb7c274a9---62148987268.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/lizupovevoleguwob.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/60470100953.pdfPDF link annotation
    • http://zatacorp.com/upload/files/borajifupazoxil.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/79511164658.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/vijinatome.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1612f081cf153b---ramirawekosugonegujuxa.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/81734008838.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/15292342258.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/fovuvam.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161319af9054ed---84563593565.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/16016499912.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/fotixolororizezu.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/poxigafokagu.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/75858912449.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/tunoguzuzozafew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=bangs+to+frame+your+facePDF 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_off0000c18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18A 16176 bytes
SHA-256: d06adcda15538de0d6d077cc9feca99a345bd196cbc18e98878ec0098e5e1665
font_01_sfnt_off0000eac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC2 10808 bytes
SHA-256: 7277d604340f539a8e2589e972bc8663d24658ec60d83a7e7545400a49151a48
font_02_sfnt_off000103d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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