Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab046b862ac3f9a…

MALICIOUS

PDF

78.1 KB Created: 2021-09-01 00:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6a729c686de4c6fe3bc7b3e5f3b4c6f3 SHA-1: 42990f1dbd3dda1f95da813f20f774663092922d SHA-256: 4ab046b862ac3f9a9b1723c377d0aad372c237fcb51d4b50c92e7a68b42d0f50
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. Heuristics indicate the document functions as a link farm, pointing to numerous potentially compromised or disposable hosting sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple PDF link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://edu-mate.kr/_UploadFile/Images/file/92272810190.pdf In PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/dalidutuwog.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/ziwevo.pdfIn PDF document text
    • https://edusfera.pl/upload/file/dowubagezimalakosuko.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/22298497983.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/bixaboputinurisegufopeza.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/62110441491.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611543347fc18---zaxixuzilovaje.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/nunap.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/f292d0f1b7d081108eb9525df20abf63/21905904515.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/rexawama.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160834ae347581---wumunalu.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/8sq6s4grtnivic6s6rest8lt85/lubazadogepesopure.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105130546329170.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/angdbt097s1iud5t9n4q7j8eb6/wuxafudokadakaju.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607bd925c68fe---66858303081.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/52751418.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf11e31611---metabobojomitoniliv.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/vetunibepexufixaxemude.pdfIn PDF document text
    • http://djapm.com/userfiles/file/23047523379.pdfIn PDF document text
    • http://partnercable.hu/files/75497742612.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/tukubusum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=material+price+variance+formula+examplePDF 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_off0000cd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3F 10736 bytes
SHA-256: 6dc6c861af2b604eab35dda3c5cbe8322c51ea503dc56606b965fde2cad8a0de
font_01_sfnt_off0000e5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E8 17168 bytes
SHA-256: d20996df6ff540f673a31c145b506c708083de8a62d38f00be59c4f7dc06e451
font_02_sfnt_off000111e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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