Malicious PDF — malware analysis report

Static analysis result for SHA-256 4236a7d52dee119a…

MALICIOUS

PDF

74.9 KB Created: 2021-07-28 06:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: c78f92d76a07d3580d04e5536199df6b SHA-1: 9e314fef364ba2bcdfa051a489e6beb870cb8fd1 SHA-256: 4236a7d52dee119a3df74b134daa291dc21d875c28db1d2694429fab9470d9f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://aaaexpressheating.com/userfiles/file/wowewafokuxefexasemi.pdf In PDF document text
    • http://rainbowcaterers.in/userfiles/file/54562840436.pdfIn PDF document text
    • https://maturana.cl/upload/file/jizadidedipasuxagubuv.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/67514493004.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e34a5384a5---79089953259.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a77ce5595d7---24613468033.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/58591972548.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bfe2c226a---48854677946.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bc2bb40b1---bisimukimi.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/659494abaa0054aa68a6efd5938ee9aa/mapefuxodeka.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/7ff93ffe7c72e0707f4b93424ffc29a0/kobixakisirixuboguvelami.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f49757af54---kovimalobimebemumabonotud.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210619161801623.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/a7fb5a418a00dd15c322a6345de7c927/zijemivebolepeligivutog.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/73792249704.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/53068230584.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/o8v4u14km9jfnbu3bel9jl7826/desusodapulo.pdfIn PDF document text
    • https://capecoralliving.com/media/file/zinasagonesalufofa.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/55633743325.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/98459874392.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/dujepawiwuxo.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/dozefifevaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=city+of+troy+zoning+ordinancePDF 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_off0000c13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13A 10644 bytes
SHA-256: 17e412cf96b95b0a9abb2c0aeca83d64f2880e5d0a41e12d8e65c65fa213727b
font_01_sfnt_off0000d99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99C 16240 bytes
SHA-256: a02fb63794655d981299a41a052d5eb28bb78f7680656023e81be98ea72b9dd4
font_02_sfnt_off000103e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1