Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e1521cbb9a1884…

MALICIOUS

PDF

86.2 KB Created: 2021-07-23 12:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: afbc858c929d1ab975b471e6b4bf2977 SHA-1: d938c9240595692913d0a2b95192fff239d67975 SHA-256: 68e1521cbb9a1884c45f78b9a645ceacc2bc7adafd29908eb712a25dc78737d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript and numerous links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of a link farm on potentially compromised infrastructure indicates a tactic to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ee914f478---basawitulagoruwu.pdf In PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/sojajagezofaxitukutukit.pdfIn PDF document text
    • http://for284.org/clients/7/74/7452b259410349f427184d5eaa48bde7/File/xenudovuzujevibogugaxiv.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/30002259528.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f7ff1ae6d---30376422094.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886340c4cef---dupifotekavisip.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/s85tj789cbqhi08o1t4s2irfua/getojaxexazazo.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160cf0bd53c1be---jugodapuweletajudunuli.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/pemibutamagamawazipa.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160907d66cb0ca---64823583919.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/rubuwa.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/7ab59c87006466d100830ab8d9ec1b18/56438754729.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/84f799e2f44e05b74644de2911d87d50/19727613124.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8caee0d018---5005583138.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/25509439661.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/vefekanolufufezenenerixo.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1560b4f74---kilavomizogetatabujin.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/90415843149.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/gepalubusorel.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/529275d4cabc2352ebc7053272204bb3/wajafazoxevisir.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/78085357540.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf799e66cf---semuvadazifem.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/b8bm3itogaijmpe8vhn4oid1j1/zisaxipesusob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=2021+federal+pay+scalePDF 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_off0000f04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 10508 bytes
SHA-256: de66c55203a5ad038458c4081370f04eafb867103c62b5751cc0d61009ccc4de
font_01_sfnt_off0001086f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086F 16400 bytes
SHA-256: 1f9a0a647d65f10806607725389db772a30a820911ec4e54104f666bada6724d
font_02_sfnt_off000132ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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