Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd332b55546deb9…

MALICIOUS

PDF

268.8 KB Created: 2021-08-03 21:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4c3c8dad98355f070be7f2f0c925b9cc SHA-1: 114097358b6a84d61ad97f95aecd534126630bb2 SHA-256: bfd332b55546deb98b920437ea6832b00506306bb17026876e1045d8dfd60c75
74 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier strongly flagged this PDF as malicious. The presence of a 'download button' heuristic further supports the malicious intent of luring users to download content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9692

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://autohondl.cz/userfiles/file/38765609351.pdf In PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e8aabdc8ab04ac21cf9b4d833331c290/kivutinikomaxa.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/85863892509.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af97ee2ec8b---42894512859.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/95023429881.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/gamifaxoge.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/23017890128.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/64087556450.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/logumixexobazelikem.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4d0e3ecf81---59414389195.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/1d7de9a1897b63fa40f7c5f420b34509/nobuvinavegiwit.pdfIn PDF document text
    • http://slsnn.ru/content/files/60698559307.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/b20a2274e95466759df1232d75bca189/9820190366.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/c79a4b6af716db7a482a8b615c7be6e8/46459788230.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/8be38c4085f8e32559d52c89e4a22ddf/wuzawid.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/98oc0ebjg4rggm374tf3km54i6/28792716514.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/11149604565.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/635gpav81iggqmltv5od3u35fe/71794619526.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/wuvisiwijinowowoje.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd89400d3f---6458583419.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/h1jhtoaoc8el8u0aokvsstaps4/lunujodegoji.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/sutafifepenenonama.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/11596224138.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/gofujudan.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/acbcfuseg67g2sq64hfavlgl50/dejesibanijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+binding+of+isaac+afterbirth+plus+free+download+igggamesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003a2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A2DB 7728 bytes
SHA-256: 47060cc69926e5aefcd33b4c1fe332ba557d8a48eae7dab6540f5780a4ac7ecb
font_01_sfnt_off0003bcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BCDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0003d4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3D4F6 11356 bytes
SHA-256: 2b68117d2e6c86e6eee4abf2b408d04d5014171fd402f38c0b8bc118bd9abf90
font_03_sfnt_off0003ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3EF26 20828 bytes
SHA-256: 618e2bb079d73401f82d2359da3ad245ceb9268d000ba3081704b1fba23dc989