Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52d726b5cb7b018…

MALICIOUS

PDF

74.6 KB Created: 2021-09-05 00:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b9230a3384fac37f1aa198ea9f503415 SHA-1: 72411439f65152d4c8186a962ff4d05db8542f00 SHA-256: d52d726b5cb7b0186b56aa8a01c154a3c619b2291c8430ee061ac75a8d86f7f7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://eastmanllc.net/ckfinder/userfiles/files/goxesujuraxinemufa.pdf In PDF document text
    • http://infrabud.eu/fckpliki/file/45924813233.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/21681207508.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/wujogosobafanipodigiwedas.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/805kb1gtss9qahpjajopr6oio5/deweletitakakumos.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210828022713.pdfIn PDF document text
    • http://renknh.com/ckupload/files/3545192865.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/84457682156.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/piporezolibu.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/nibaxorujol.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c42b51f8f---jozodet.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876ce4aa5d7---10358199827.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/88060049831.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/dufazetidorujaza.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/pokafe.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/8536d47a48n7gaorf07c6ee720/21931265900.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a14d118335d---totuninulizopukafadevo.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210529202151.pdfIn PDF document text
    • http://hostingalani.com/calisma2/files/uploads/kosubose.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f814639ff40---fejinakebowuxamazuluxo.pdfIn PDF document text
    • http://saaretravel.ee/images/file/57909594052.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/27646159311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=fluid+mechanics+4th+edition+solution+manual+pdfPDF 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_off0000bd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55A 18216 bytes
SHA-256: d64a66992f18928fa863cede38286ff7eefa07e6895822e60f6be8660ddf29eb
font_02_sfnt_off000103e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 10940 bytes
SHA-256: 42d2f3ea7961d8522f4b33ab6d64f2eb7f4aa547c11da35a339458ae7f1b23ba

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