Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4a7a5e485feffd…

MALICIOUS

PDF

84.5 KB Created: 2021-08-17 09:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: f3a82105395d61aede5e91e999a57d72 SHA-1: 03d04684104bc8ac7df07b27c9801559cac8b04b SHA-256: 4f4a7a5e485feffdf892fcb396a3e5ec62cbcbb1a4829ccbdd01e2f5d70171d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the nature of the link farm and the ClamAV detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/27008d371939f7529cbdc86525650d37/wisufewojuxif.pdf In PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/72522400129.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e8abb371a---25308003155.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/5753889874.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/korixomisikegamalekomox.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/xowiferupuvenezovodekixok.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/a7f7648ca6606d9f475284f0e00325ef/16905891417.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/36456839628.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/87762567324.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/tomovalejelam.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/82027846745.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607752aac932b---67284279753.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/66875183344.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6f2c7b8e47afb20211dedab27568cddb/78261542481.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/dbb4d76d25d1ea0929778f6718a6ebb3/nakazesanizufoduroxa.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-7-22/20210722155842559342.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160854afdf3fbb---50298318308.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/57114824891.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/21004303182.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06c3c8043a---82065117582.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/nuzaxewomojavixazamepisa.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/5385317863.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ced4925ac7---kubifotogasin.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/fe50ea79544741d6cfb97c81c730736f/kukozub.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/t7sa7lrmt0e7s56hnm37ss9hcr/11929470827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=guess+the+image+roblox+answersPDF 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_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 11020 bytes
SHA-256: 7aa2f3fa73c58ec72b93847ce0af0a3a1ecfccc4adb4aac075ea254c78186c4f
font_02_sfnt_off00011339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11339 18504 bytes
SHA-256: 716c537fb8519ee1636c107e5220b863563e5e5170c57f2fa8d2f57505d0bcaf

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