Malicious PDF — malware analysis report

Static analysis result for SHA-256 500ede4e934d0f36…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 23:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e1d583ce8064d729eba6b272f61b5c8 SHA-1: 19800dc36b2498672a4378790259e41a195a0235 SHA-256: 500ede4e934d0f36ebb9c008a4d814a053cbd42a6735ba183688b12bbe0e2f5f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.cerathai.com/image/upload/File/jemisa.pdf In PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e808927426---noladolelolazuzolezef.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/terileruxorobunolilutupew.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ab9a9b4487---6724976442.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e79950b17---dulaloruv.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/gmfiv7o1c8gokollq1jneoq6nu/80365484250.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/0953c43afa18ba36b32f10ff8826a091/13296040973.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/bibaw.pdfIn PDF document text
    • https://keongracun.org/contents//files/zuwepe.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085292fd816e---nedotiwemusajudididimixow.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/20824f1e0dbe9a6f770912f7b23eeb7f/mopolivipizerasipu.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/7d704772f3c5e072ef8ef595eb71d3ee/30347999402.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/bapujukamovugekegofa.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/nozixolepejaziwijok.pdfIn PDF document text
    • http://rayer.cn/d/files/28846354417.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/wikokusivi.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/beninomipabadisudejo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a71b48915a9483230738427e0237f234/1055739752.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/lozepabijiwetide.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/82073363516.pdfIn PDF document text
    • http://fygl.net/uploads/file/130347592713.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/ridafix.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/47528140945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=somewhere+over+the+rainbow+sheet+music+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_off0000d773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD773 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8A 11304 bytes
SHA-256: 3bed0e855823e179027e2f9beb223f4e98892508176ffd5e1e42fec42c3d9aa5
font_02_sfnt_off000109bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BF 17584 bytes
SHA-256: 537c26328a8b4311e97dc2ee24e1937038fea30628e28d7fca161f03225bfa43

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