Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa59a087a40f557…

MALICIOUS

PDF

80.9 KB Created: 2021-09-10 03:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6846fbe002eb7c7c1b6c8f3edea8e493 SHA-1: 66807509cd9fbe470d381980066480259b2363cb SHA-256: 1aa59a087a40f557dfe77c34e656a095510027f95b90ff0d4e5c620cdea9e113
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm designed to manipulate search results, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://xn--hh0b97d8is16e.com/userData/board/file/sivozomu.pdf In PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16137d84042074---5629823624.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/61019565230.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/511e5119b2e20c67d6fc8dfd30e183a4/27973743282.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/jasov.pdfIn PDF document text
    • http://micruts.org/userfiles/file/begotolidoxofikudavebun.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/9901517504.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/52173945830.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210907_4FEAC9C0CB391714.pdfIn PDF document text
    • http://snsi.jp/image/news_file/32963237500.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/kejoginulobaxax.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/48225665626.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/90083492260.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/xifobeji.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/32748470940.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/velolukoxafifobakapa.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133e912e1af7---pilorudukaf.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/9074072485.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/74563173327.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/jawotasiripalejuzubulezex.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161328a72dab70---42467155672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=beach+buggy+racing+pc+windows+7PDF 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_off0000d7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F3 17568 bytes
SHA-256: 184d8e8295da6d2deeddcd877230c0c1d89cd59e291d0510ad174665c9556da9
font_01_sfnt_off000104ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC2 11192 bytes
SHA-256: 84f090dfdd2ae0110c0c5b837e3af4d68768a66f7b14cdb7d5ee9547e200205b