Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e7c36f24540045b…

MALICIOUS

PDF

120.0 KB Created: 2021-08-16 01:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dadeb20cd3d3bfc3a0423b74742a4fd9 SHA-1: fe4b019596241768a8824aa3ee3c6207fff78113 SHA-256: 9e7c36f24540045b3e4324b2a448368f97c95cf9dfa131bcb290c6e72251f3ea
236 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document's content and heuristics suggest it's a lure for a remote support tool, likely to facilitate unauthorized access. It also contains numerous links to potentially compromised CMS upload directories, indicating a possible role in a link farm or SEO poisoning scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098b3135fcd4---52794194364.pdf In PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/36c403dd3427ddb1f1c23b1f7fc62e9b/27636246555.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/53693369140.pdfIn PDF document text
    • http://www.grifin.sk/files/niserujurixaxebuvaxaluwo.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160813577a7b26---99605822340.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/vqppjso7ici8l9fm5tql1hfgrq/27244837218.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/d49tcae0fk18d46t7rr8pk6vp4/34161345513.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ugq1rj7cirnn39dmj2l3lc0utn/26019408251.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/fojonuzowitefedo.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/46442202535.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/tinexezipatevisawafidekek.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/22696207477.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/51387969177.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe9473feb6---41235768821.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/70119b16c3553a5776c163b6e8f6d05f/subolejemuxufa.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/gikizewigomufikud.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/124460881.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/89042871862.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d054879869c---numubekidepasuriduwu.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a27c9139e31---77921499763.pdfIn PDF document text
    • https://led7.ru/file/70352354557.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16106dd6a1c2d2---sopepigufidawibobomulo.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9901377a0---zosugaman.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=octoplus+lg+frp+tool+crackPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000140c2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x140C2 26332 bytes
SHA-256: 404b4c11c588bc47526df3b3ff4e513ebd284c5057a8b7711e0f704eda25fb8d
font_01_sfnt_off00016fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000187dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187DD 18640 bytes
SHA-256: e21a7e33aedfb86b2e0584824eeb6619871ce2c82017917daaabeb2b33d0c0f2
font_03_sfnt_off0001b7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7FF 10544 bytes
SHA-256: 3e43c7746383d92f8968a81383c64c00c61ea86a9550b81b620b2d6319fab73b

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