Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa6d0903ba34b7f…

MALICIOUS

PDF

80.7 KB Created: 2021-08-02 15:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73be2cd3b64635cbc67b71d3a324674c SHA-1: 94ba1e2cf8b70a7f0d3e43f46f9c8484bf97842a SHA-256: 6fa6d0903ba34b7f0a10a5ff63d737489fb11917af6af70f801c50daef0b987c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://catamma.ru/uplcv?utm_term=ejercicios+de+porcentajes+para+7+basico PDF link annotation
    • https://economiadecomunion.com/ckfinder/userfiles/files/54402289971.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092da1c1cc58---71253266099.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/58380962653.pdfIn PDF document text
    • http://teplospectr.ru/images/files/68071029670.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/q5b4ih3inpunm7p8jhurbpkq6l/jilodufufujalo.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/86260411683.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/vonulipigukunogesup.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608524c6c7681---jalipekemolixoxoja.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/drh06b9hm2uvrbvpaq65cb1vs6/sejulawabebotedogewufof.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/ratepobodaropuresu.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/27714339348.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b750079d8a8---wizozidigavon.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021080107553652288.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34181a2513---fejevotazaw.pdfIn PDF document text
    • https://werbemittelag.chupload/file/27167915000.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/xituzexebizu.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/56359450187.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160be98b5db1cc---86418895739.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/rudejasoj.pdfIn PDF document text
    • http://bakoca.hu/files/file/39233493180.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/90221923013.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/zopigimerusafewepawaxukow.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fe278a1abd6---pefowikepufijotemozo.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_off0000d713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD713 17164 bytes
SHA-256: d5bd5288ee39cceb375312f8717a9bb813ff06d4a19d0d67ea4ab5dc7324c06b
font_01_sfnt_off0001032a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 10764 bytes
SHA-256: a3303a9e7153dbbd72cafedad11651a3c4282c0c07491e285cbfe446112ecc6e
font_02_sfnt_off00011bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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