Malicious PDF — malware analysis report

Static analysis result for SHA-256 5307fbe397ffb07d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 06:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 788521b009d8d8c4ab9fb99a65c52f19 SHA-1: 31f449ac3345a24f57a59961157e3049674ec0e9 SHA-256: 5307fbe397ffb07d8df7f52ae29888ae7dd7d5e6b8aba4532b7f8974c1db3ef1
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The presence of multiple 'link farm' heuristics reinforces this assessment.

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 https://shoppingplanet.ro/ckfinder/userfiles/files/bojarajipenirod.pdf In PDF document text
    • http://dallard.fr/ressource/site-image/files/87261440929.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/23139130052.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/51381616453.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/2fd1af64eb1aa7a18fe6f5f703ce9ed6/77975880358.pdfIn PDF document text
    • http://konberdbio.com/upload/files/rijexesifozumibukodalorab.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/xixixatopemelu.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/kelat.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/20432715568.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/34224354685.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/44791817814.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/19971641969.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/femejogisofexulete.pdfIn PDF document text
    • http://bamila.vn/luutru/files/wikag.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613de1b62f74e---wukujelunujugivaxudari.pdfIn PDF document text
    • http://vit-physio.de/file/85952088750.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/fimiwivenuzowubotiladed.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/b74a97594d10a08edd610e2ba1aa4ffd/12413121756.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/pabetawutokujuzon.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/bival.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/zezebodaviwisupivotedi.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/fepunozulewili.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613867b5160d6---dagovalitod.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/77657604300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=solve+equations+with+x+on+both+sides+calculatorPDF 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_off0000ceed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 11180 bytes
SHA-256: dea51e6d69256cda1acb69f1ee0fdbcf70014d10423375320d38c2f682b1fa7b
font_02_sfnt_off000100f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 19828 bytes
SHA-256: 5ea07244e9fdb4e11be2977c006b315637eadf15850a3e299798eca4d844a408