Malicious PDF — malware analysis report

Static analysis result for SHA-256 5164a6d5edb3464d…

MALICIOUS

PDF

99.7 KB Created: 2021-07-02 03:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 17273635acc3102f0d09ef989de75ca2 SHA-1: 5cc032b56248004c2e3355c5c100a2f3d59d4a67 SHA-256: 5164a6d5edb3464dee737669edc459f1036f089e22aa0c1b4063c5066ca19b1d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream, which is a common technique for delivering malicious content. The numerous external URIs, many pointing to compromised CMS upload directories or disposable hosting, suggest a link farm designed to redirect users to malicious sites. ClamAV detection and ML classification further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

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=the+definition+of+sanctify PDF link annotation
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/3281fb6ac29e0f403236873cd5fca524/25188516565.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/ruzemuje.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/sjircf3mn0uqfd5d43tbt0h82f/fawegad.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/24590219867.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160bafacde2045---49314005793.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ad89583fe---sijajurawoxeluzimuxomed.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/rafigagofibelosusus.pdfIn PDF document text
    • http://fedoro.ru/upload/file/54464794177.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ieqr4j1kijmqhoqrcugio37co1/52321313238.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/ceh0h3bai7sj4f2bkqup28s73p/80574391757.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/28034499.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a04be851e9b---jodarovub.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a89a2508efe---sovimulomuvuja.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/47197867282.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/93e7c1e203f4c8a3ca2445e09000f383/93769586380.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/54103524591.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/61327675338.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/60113650164.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/vifopejijetafuw.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec5e6c42c1---36924123238.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/b2fc31a7e594a8ea3ba92f389af2bac7/6483244159.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/22398080766.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d293bfb15c6---renamekogevalapovewuxoget.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/tekimenunikosijej.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010620.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10620 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000ee0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BD 21928 bytes
SHA-256: 2feb2bfb8cdf7787fe0c4ef4fce2b98a3801b2bce7c35587d760831b8a3db8ae
font_03_sfnt_off000159c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C8 3872 bytes
SHA-256: 8d1dd08c6fe59725f5824b12136888e1d13d3ec8e89c19a14ddbac9729fc0b9c
font_04_sfnt_off0001687f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1687F 10504 bytes
SHA-256: a8b79125eeff617ac494815dfc52dbd0847d4da2f521c0f7c6d0ba57d51a339d

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