Malicious PDF — malware analysis report

Static analysis result for SHA-256 e334c110b75b6af6…

MALICIOUS

PDF

75.1 KB Created: 2021-09-01 20:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e7da1bfc2c968dc3b1f333978b2f2c72 SHA-1: bcfd85b5bcfe24b7ef6b836bbc4350c573604e22 SHA-256: e334c110b75b6af65043c0306ce914cf71f2ce24ec3bf3f891d37d04ad29a5e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely intended to lure users to malicious content or phishing pages. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/og2spu3iuk0s4ipl9344sq4vsa/46992293248.pdf In PDF document text
    • http://pogotowienaukowe.com/Upload/file/xoguzakejebot.pdfIn PDF document text
    • http://sakem.org/userfiles/files/kakabekoludupamuviwotot.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/cd9abd61c22beb03ff2730910f840cff/47478507381.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/tuxavitomogavodewale.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe6e83fc89---52409202619.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/pedikibegekojuzujivatijof.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a1itbd84nah76ic9ghp0rhsod/90372460205.pdfIn PDF document text
    • http://change-sexy.com/files/files/ragikedifudoki.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/713c1f2d1ef5b7679692cc080ee0db23/7336780942.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/tupazutatiboxoboviza.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/j2lbe318pd6qnailk2g2tkn102/bakukunasibedagoxadojul.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2bfc62264bb94539acf90003158ce233/bowuzedulodezu.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/e2dcaaf6b20c72e77fbe6844a5f47d3b/kanarokopaj.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/wagevujib.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/9e5942f85a10efbeab19e6571333dd6e/84439865763.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/majedepugojiveragiranogat.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/45567053585.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/d0417dca385f733df93499723f97314f/laxilofifunodikeweziraz.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/91281647749.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9828574c89---fobolelilonimuzebafosu.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/5310bed5441b7f929a25117135fd63b2/xekixalawezinakida.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b2fbef4bc.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/95286535402.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aadbbadeb5f---15233297813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=state+and+prove+work+energy+theorem+for+variable+forcePDF 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_off0000bf14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF14 11472 bytes
SHA-256: f05a83c892cce503ee03e188a5980921405ab49b10f0a444d7ffdcba2fbfae91
font_01_sfnt_off0000d99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99F 17688 bytes
SHA-256: eab168874715bab551aa022fe14b0bed296e11cf8f1ab8426a1a2d472e823cf1
font_02_sfnt_off00010581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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