Malicious PDF — malware analysis report

Static analysis result for SHA-256 4932a2fc7607df25…

MALICIOUS

PDF

84.0 KB Created: 2021-09-02 07:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d163946d045950f3a9088a7fe2d49b51 SHA-1: cb0967d2c3ef3661e472789cff433a17856b1a06 SHA-256: 4932a2fc7607df254a7da34c75f65e37e2e62b7993bfec23d2dcddbec5f55957
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the nature of the heuristics strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://alexlunacoach.com/img/editor/file/sutotabivogobo.pdf In PDF document text
    • http://thanhtindesign.vn/uploads/image/files/domudozomuvoparu.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/poluruvagabegojowemum.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bff6c8fa8a---vuforutujokevixemo.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b84a3acfa9c---59931194084.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/miwubifiwabezekawurodiges.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/lolivuvofevalutadi.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fe9f81732f4---tadotosopejamawelok.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160f1b4565ae96---pewubesafovudijogut.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/fubajolim.pdfIn PDF document text
    • https://ancoraeducacion.com/images/12923756170.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/zefawufezowudadisuf.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607baed3132a1---faderifaretozipisuno.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16078862414d6f---sirixupu.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae395e71610---ratalibipiwetutabirep.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7555f713e9---kamafokil.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/7b7f5fd4f659f199f804bcd2b76f6fb5/13494386543.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/41709018780.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b82418e8b---57737328360.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19a7c1763f---fofiworekujederuxafokidam.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/71784563123.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210624/file/zasotigedidovejera.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/997c449b9e11a08331471657ec4ab968/37535816650.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/370689432.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/votuwilevira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+get+chinkier+eyesPDF 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_off0000e486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC98 17608 bytes
SHA-256: 21fc4331e716289da81f15689f63194df98cf35d23cadffbd3776d0047ad3b31
font_02_sfnt_off00012a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2B 10584 bytes
SHA-256: 9b9c819486146db607703a60e7c4c2e384d1aad41286bfdfa80185ba75d0d8d3

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