Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea06c4b5bad1dba…

MALICIOUS

PDF

82.7 KB Created: 2021-09-11 01:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 35f8a26d959b6a143ca15456c6f56584 SHA-1: ebc511d81dc9821ee1066a7920c31a7a0545be84 SHA-256: 3ea06c4b5bad1dba03f87e16d0413e898ac55dfe463c8e5f0a14ddf8dfa9ed6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript suggests an attempt to execute malicious code or redirect the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=seventh+day+adventist+apps+for+android PDF link annotation
    • https://tnmkor.com/FileData/ckfinder/files/20210902_4671A7DCCD78D289.pdfIn PDF document text
    • https://temahr.hr/files/bubomedurufu.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/binugimaxis.pdfIn PDF document text
    • http://iscelenie.info/files/file/50907532009.pdfIn PDF document text
    • http://perfectsextherapy.com/public_html/userfiles/file/56206544104.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/68946129602.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/goxofereforifala.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139dd94a758d---68884663946.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/91380618502.pdfIn PDF document text
    • http://simoncaulkin.com/images/gajex.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210902_233842.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/48556986069.pdfIn PDF document text
    • http://onlinevay.com/upload/files/83426605045.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613642575ac26---22661641024.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/26891401617.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/nopefonatelenejipalovoger.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/dusosomoxorokavolevurudi.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/renuv.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/mimejiwukututikokip.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/wukofutesedile.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/95284299073.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b176fb6de6---88506765958.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/3aafsokcabki3iama57stuv2aq/63401316691.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_off0000dc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3B 10804 bytes
SHA-256: f9472c532a1b2549fbcd81b52eaa50900cb65a95df4941b3a8d0fe85ee89656a
font_01_sfnt_off0000f514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF514 18360 bytes
SHA-256: bedf58b22a309c105ab5a73080a1a5707367101712ad025948b9e5f5513c6ef1
font_02_sfnt_off00012484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12484 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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