Malicious PDF — malware analysis report

Static analysis result for SHA-256 61087a4a8baa8c53…

MALICIOUS

PDF

72.3 KB Created: 2021-09-03 01:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aedd316d920a0f08381482c0e2c6c436 SHA-1: 027aee1b4b84262d977ec76045eefe94328764e8 SHA-256: 61087a4a8baa8c5395a2711b7126f86a8857ba0e4c54114e4af988642956c62d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or download of malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://smidgel.ru/uplcv?utm_term=adding+and+subtracting+negative+numbers+worksheet+year+7 PDF link annotation
    • https://drddvichitra.com/userfiles/file/94108358298.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/0345d4a6e8093cdcc80546d0280cf5e2/medibupi.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/47418869910.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607047dc3c562---satibimap.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/31314641171.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/mevetin.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/nmioktfvm4rh4p7oap5366193h/kotesewar.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a724fbf95510a7b621fb6c67b9aa9cfc/60671319380.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9d5926160---33540247075.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948107ad112---1313672788.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/6b36fa2f0be45a9d80fb33ddc78d78c7/27642366162.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb32dbf65---belebikosurujobisajamube.pdfIn PDF document text
    • https://fratellifurloni.it/file/guvexig.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1414fccf59---36419639557.pdfIn PDF document text
    • http://saydersan.com/firma/files/kiluliwexesojutug.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/fitatalorimojovobuvalone.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae0027c1c0---lunuvikumo.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/vtbr9klfq5t8rpc7bl2e4a1cv5/pawetar.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog//file/razivugitabinagewixegevuw.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/35385071282.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7e5f7ef256a1faf8875c2f9cd6cf0a9e/pimaf.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/17032241674.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0007b1785bde755cdb22488042bcef7/55548913374.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/19626f0fc30f868762064028134aac01/sasasufuputumi.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/831863aac9bb975f088cb784f71de13d/divoxusaduvi.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/75330156822.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_off0000bb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB27 14828 bytes
SHA-256: a61a15b772aede7970523b385c609e2eff2f78abfbb732a57686a3a571433011
font_01_sfnt_off0000e030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE030 11400 bytes
SHA-256: 9370bff5db5fba30eb55e4dee7bdb7a38c973e9ec824b1edc461d363639d0d69
font_02_sfnt_off0000fae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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