Malicious PDF — malware analysis report

Static analysis result for SHA-256 c30593eed34f7538…

MALICIOUS

PDF

80.2 KB Created: 2021-09-23 03:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: effd93efc49f322cd5715ef694669dea SHA-1: 291b949e025e22b31367012642ecc47390545f22 SHA-256: c30593eed34f7538a242b108cd117a3bd4c4942006973079cc25aff878eeee5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to various download locations, indicated by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure points to a social engineering attempt to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://happen.webasl.com/userfiles/file/muxotebirofofakenukoji.pdf In PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d2a931f2---35457655456.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/40216745851.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/e8ec123fc161a1ddbfb4ca8ff6b8a795/82888415306.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/tejobotisofumanux.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/wopijazadokalenuwi.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa3f4ac43d---69879323348.pdfIn PDF document text
    • http://www.celso.org/download/27681512718.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/tuwajajid.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/2074763420.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/luxovap.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145644b806eb---pugozalapenevotuwave.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/jimudijimezupo.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/zibugafekokezilomu.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/44231376685.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210908122319.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/vefon.pdfIn PDF document text
    • http://greenegiving.aboutgiving.net/sites/default/files/editor/file/jowetukodar.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/54783613295.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/pifevuzenikisomikafud.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/lamunorikidegarukumipaxi.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/87012123266.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/45719513364.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/mapivujapulupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=star+plus+apk+free+downloadPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210908/16310630817517.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_off0000d3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A0 18008 bytes
SHA-256: 02cee1fe5185dd267aea789528c99f6c4bf5d64dd9f63467ebd09a4dfbdbbe4f
font_01_sfnt_off00010246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10246 10752 bytes
SHA-256: da935fbc17ba5e4f08da707e02ea95d7b130fdf9c8a534a71676bb84f8c99d27
font_02_sfnt_off00011b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1