Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58fc134dde64fbc…

MALICIOUS

PDF

87.5 KB Created: 2021-08-09 03:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d7343546f9576b039ab6bb8803a9404 SHA-1: 4db83652d5b51716ef3c00ddc84e6e85fdb5bb2b SHA-256: e58fc134dde64fbce0bf660b59a65c4969a5dfd23c7181da003e40323ad85336
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. Embedded JavaScript was also detected, suggesting potential malicious scripting capabilities. The combination of these factors indicates a likely phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ksicp1tioems0ov544r9g6k5at/11885151916.pdf In PDF document text
    • https://qian-ho.com/upfiles/editor/files/nemuwekewulexo.pdfIn PDF document text
    • https://senhewood.com/d/files/5572142231.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b883361d30e---13136479632.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/rotijibuwi.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/99848427714.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/momesebiwedazonivig.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/6a8825bc3f5c04b7c431fb91d926a050/58970545531.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084c58c53ced---gukowitopevoxoseg.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/zilewiv.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c759023c32c---21105504909.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609671ab64ce0---govujenogopil.pdfIn PDF document text
    • http://congtyvima.com/images/Download/darisef.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/60867645539.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079544fd89f8---44262270403.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094679720b1e---10294946079.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1d704e9fc---21218475274.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0215e682e7---gebuw.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/dugov.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/piviwagazoxoz.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/5187528083ed031e64fa1a811da6b750/jixarema.pdfIn PDF document text
    • https://brakos.it/file/wivuzalakiwupedo.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/88138353380.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16096c2367b8cc---biwegap.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/sorokemiwupora.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/meruzebavojenisewuwirix.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/saxosibenogune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+install+obs+on+chromebookPDF 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_off0000f155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 10804 bytes
SHA-256: f4f6252f58d7f04602c09aee55a12e62d8731e4ed644fbb870fcbdfd0ab78394
font_01_sfnt_off00010a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001222a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222A 17768 bytes
SHA-256: 19e0f8adb87d706ab44c548bf7c37859d72f9920145bf58b0f889c5588c106aa

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