Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d07c38a3577176…

MALICIOUS

PDF

91.6 KB Created: 2021-09-01 22:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e9d7988c3a00c308b548b4bd10e244d4 SHA-1: 109ad8dac476945f93efb66d17f651b8bb9dafdc SHA-256: e6d07c38a3577176313e14b16d954cd38c0562642c85601f0ca94e8e1217831a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://inwebjor.ru/uplcv?utm_term=how+to+pronounce+aimer PDF link annotation
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/6e9521902c7e0d12d93a845aac090b23/72753376033.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4150e1a98---miwaxexas.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/54995298708.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/8f141c231431b7901f6a071971837b78/51252411602.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/20298414453.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/32453264978.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/wizulapoguxinadojuza.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16117e11bb5ade---wutazepufixi.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/xumepesafimozo.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/tso9v96tf7ngspr4ga9vp89rr3/gapijimolamulelularaduz.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/55584328249.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/8ieujqhkme62l62s8l2eb93mig/70946203762.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/redezavubeb.pdfIn PDF document text
    • https://areicon.com/images/file/30867911705.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/25122548621.pdfIn PDF document text
    • https://unitjaya.com/contents//files/41501284989.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/0aedd50300291e031725a7ff088a9863/faporibezu.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608333e07fef5---goravalu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0d9c5b74445159610ce89706f9f67cf3/wuwefidi.pdfIn PDF document text
    • http://samtle.net/ckupload/files/87285990123.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/75972584555.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/webofesugotadinuxifoto.pdfIn PDF document text
    • https://0900107678.com/upload/file/mezavajibape.pdfIn PDF document text
    • http://songiadabinhphuoc.com/upload/ck/files/wabapikufenuj.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_off0000fe4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4B 10496 bytes
SHA-256: 6cf8ab5644e1dfd14f2f7decfc4d72d9c76d8473c0481e684fbc64bdbf3e73f8
font_01_sfnt_off0001162b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3D 19096 bytes
SHA-256: 1e14f141821ba57267bb03ed8e81f3ffe4530afc3d7b906f33e4a1fd0941f079

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