Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce0e4c60c405db5f…

MALICIOUS

PDF

122.0 KB Created: 2021-08-31 17:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4b8bf6e2d1ae78349e215f136d3542b6 SHA-1: ee254d1cccf08dc2304e64e696db95085a733408 SHA-256: ce0e4c60c405db5f48744c0051507e003ab1be8d3f9ca0190e1c4cee5e9d8527
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/l05uhltrj5sprkbiul6hkkdhir/vowujotusunuwubumem.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/bf1f916edb763799d3bd1a891f277b74/zixijemikebab.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/476f684e37a75a7c5ba7493de858b792/fukibemape.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/11t3oibfqsp19v5ds3v7c8jq0h/kodosi.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/67691653315.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/5b787bc66d4a87e51ffd0d2e25b0a107/terikojewebofogubol.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076af5518da6---jugemipetas.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/d0im2nehrt7h46dh5767boubc1/pipazaniteziwidomele.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/15955105293.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/24737349060.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/jirosuzekadi.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/xevodevexiw.pdfIn macro / runtime command snippet
    • http://ingenermarket.ru/userfiles/buguxerina.pdfIn macro / runtime command snippet
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16075358c022fc---mevomutuketekebutujotumug.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/eaa2c9ae1575a93cd11b86caea16ff87/72584369241.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/fa2914c1b83f9a95e76f5c94ef03c08c/7520506549.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08cb80d99---luzusetediwenasija.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f8facaf714---47014896858.pdfIn PDF document text
    • http://kccmaul.com/files/files/47442240598.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/k29ehn5a6r2r7tlohfcmmhcbkb/91828241674.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/13791749399.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/87640605755.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca663a4de4e---dibufoganepivu.pdfIn PDF document text
    • https://beyondpins.com/In macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=schroeder+thermal+physics+solutionsPDF 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_off00016e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18668 11068 bytes
SHA-256: 632d58a74405884ce72dd31ac11b2c756f6d7d110b5fcdf781fa9179003d93b0
font_02_sfnt_off0001a004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A004 21884 bytes
SHA-256: baa70be3bf4aa61a13817a83e99a9a66c69d2ce957e10651c39bd5b7c81aa9d5

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