Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31792e5f806807e…

MALICIOUS

PDF

77.2 KB Created: 2021-09-08 01:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5b8eaad4722ea505c33a4ce543b7f335 SHA-1: 3aaf085dd4e29c397319b22a68dc227bc1ef5b1f SHA-256: e31792e5f806807ee2fe59f4efccc02f04beb8c25ee2407dd7998534b3927e2b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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 https://coretry.ru/uplcv?utm_term=grammar+tenses+table+pdf PDF link annotation
    • http://hsi-international.com/ckfinder/userfiles/files/6066734016.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/uninh45o2fq6tgvq443qb6aa20/98926868892.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/romazinat.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/10196186902.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/pafafowetoz.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160837d3715c53---goxefuges.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970c5507639---bunonowawokali.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/rejakas.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/rdkpd4hh7elvmom3rootum6dm2/39292283553.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d878683393---66449093821.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/44079063612.pdfIn PDF document text
    • http://impactmediaresources.com/userfiles/file/60314438178.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7882e39cc---46951998729.pdfIn PDF document text
    • https://securityguardsupply.net/php/uploads/file/90781954924.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/rasokoweverig.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c503b180572---xazuzudutuwebifurejajadap.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/b77cabb4b5dbd38546ae4009abb7f76c/texutepotumob.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/42410060480.pdfIn PDF document text
    • http://iphysiology.ru/upload/37090895008.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/lazivuxitebexubavo.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/9424748797.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/9690a4b133f92453f8f6ba4eef961480/30396156024.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/womijevefaja.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_off0000c9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F2 17316 bytes
SHA-256: c74e7fbce9bd602d5506529d998fa4c6d814d192b19665ff551a5d1d27f3c526
font_01_sfnt_off0000f737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF737 10624 bytes
SHA-256: c3773ec430509a1ad4a18d8041acfbfcfe608ad8f874e5d9f8a2d8c781bbd397
font_02_sfnt_off00010f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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