Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57595daeff238eb…

MALICIOUS

PDF

68.7 KB Created: 2021-09-28 21:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f90c025739bba087ebaff956284f7c4b SHA-1: 09d0ff1386857332131ef325fd2b0813fae48151 SHA-256: f57595daeff238eb3a1fb2e2a5bc05dbfc4443b372c7915d457c6d1f531b1844
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://jmcoverseaspvtltd.com/uploads/files/85618576662.pdf In PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/wibebajogetikuxebev.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614079048af7f---sisup.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/94469332228.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/vidune.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/62626658612.pdfIn PDF document text
    • https://promoxcenter.ro/ckfinder/userfiles/files/wufosotep.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/4496872328.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/ronuwuwevetiduturidove.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/suwakupemawejekakaw.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48005757901.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/0aea7b8ad2f30cf348cf331449c5635d/47544179808.pdfIn PDF document text
    • http://cityfate.com/files/files/39703196142.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/79432070202.pdfIn PDF document text
    • https://penzion-palice.cz/content/42387801944.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210925_02ED82005445C101.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/puruvasipimesixolatom.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/temonebibalowekokero.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/kovepoxeraz.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/29iffrnt5s7nut7rhp0obolir0/64469995159.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/4327832790.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/93750644673.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/54950555485.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/77446420287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=doctor+who+survivalPDF 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_off0000aedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F4 10344 bytes
SHA-256: 7ef2cc670f7cde82f659929da7f7b4e11a62ab9e79b2c05a0c761fdd1788eef0
font_02_sfnt_off0000de7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 15632 bytes
SHA-256: fb47f565eb3179be86c46d03cf9870c2ecc9bd1da68d92a157e7a305314b933d

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