Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5a7d378cc2dfa2…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 16:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa577ddcfac32e6a72b74402134d66e0 SHA-1: e6f924fc12b6e3d1116a407ced3cda38134e989b SHA-256: bf5a7d378cc2dfa223296da5fca6f444f99d705a7175af4a825df7651e2403e8
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier strongly indicated maliciousness. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c6cc0ad44---xilewas.pdf In PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a273424752---pamizowu.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202108251545299196.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/10b3047abb7419c06a5155062798cd6d/mujirejepepaliwejedo.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fc3a06f26a4---fivumuwidid.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607826e605355---61899280415.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/97335696975.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/62877804043.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/42652151560.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/gufafaserexikukuwibelu.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/71c89029856ab80d85889f891cdcab6a/50512871394.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a338d3f6ee---57335609532.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/fupumufuriku.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/78473374068.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/waxogomirixudanelor.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/65376050849.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/fovipaxagirebiwizobam.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/pukepufuzesabafijoladiga.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160e82ca2d1ee9---89655522393.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16126bd212f5ff---zefefamaxuxafapezufujete.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/10221893777.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebc13dcd96---92971659793.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/tepigokuzogivoravi.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/qfm0c2rr46eae3akonmseundmv/56041780693.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/aq6aglgob9sq06l3ccb79im274/62337115640.pdfIn PDF document text
    • http://runo34.ru/attachments/file/livezaje.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/7hjbtvj4el2m36jhud2sdf50n5/35406831446.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/bopunolajubuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=candy+crush+unlimited+modPDF 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_off0000e4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 18796 bytes
SHA-256: 8933e1ec2265efcf424f50302cb9a1a3f8efbdc72895832d880f29a6fb76390e
font_02_sfnt_off00012d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2D 10880 bytes
SHA-256: a567d4f16bd890bbf2151cbdfd864411e158af45076d8ce661f21cfc76f282d9

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