Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21b3c26141f9479…

MALICIOUS

PDF

107.9 KB Created: 2021-08-20 18:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 727e5e53d6eca312d1f31a106d1a585d SHA-1: 8337ea7a57ac378d1b9846f7c50685e1590c3d20 SHA-256: e21b3c26141f94790f2a720fab947f3ec41e5b8773fc7d6a983c646529605b97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised websites, including WordPress upload directories, suggesting a phishing or malware distribution campaign. The presence of multiple external URIs and link farms indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://oniceh.ru/uplcv?utm_term=how+do+you+promote+diversity+and+inclusion+in+college PDF link annotation
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/96bbe480adffcc24b7112261e30bb079/ranixekipapiruvav.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/derazekujadox.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085bb9a98877---30362996575.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160828463b6945---90798812343.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/493677240.pdfIn PDF document text
    • http://land89.com/ckupload/files/wikekivatuvo.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/tamakijag.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/656c2679adf0d56292909c4b6822ef26/95534689300.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/4fa2d0d6ae40969b514bc1ae8d816a51/bugamawukobi.pdfIn PDF document text
    • https://partnermind.cz/images/files/nasukobetubidanutov.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/62128392071.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/672857858.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/12066314005.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097fdf8bb628---gofujobegijojavid.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/ofbv28pcumpokko6fsbvfgc8lf/4837805903.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/52099327277.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/jexefimor.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/72790659427.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/30c4e1d27498424277ece4f34d248ad9/paton.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/22350842700.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/3bc0e1fd9cd69794fbd0b5c3ca18a554/13411182315.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/rokejetolimuburajugu.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/rarijijus.pdfIn PDF document text
    • http://iworking.vn/uploads/files/kevixosadojuvi.pdfIn PDF document text
    • 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_off000142c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD7 16664 bytes
SHA-256: 632bc1eb4c3a99a911ed9abd57f97ea8f88bcc505494b9ecc41aee90d73b5b0f
font_02_sfnt_off0001862f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1862F 11212 bytes
SHA-256: b7a82ad00052645e4680cb5e002578783db0547c9ae1b2555136cf4ff9d3f119

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