Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb445fe8486dcd3…

MALICIOUS

PDF

86.9 KB Created: 2021-06-28 22:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: adf29f2a5b4f8bd3140d42a02015331d SHA-1: 80fbeb0807f28e45efa53ee3c672070c3d74e8a3 SHA-256: 9bb445fe8486dcd35883d481e9558e2fab82ced10e6b934d52cf9108a929db08
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. These URLs are designed to lure users into downloading further malicious content, likely other PDFs. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm on disposable hosting, suggesting a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • 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://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f51d77205e---17847268039.pdf In PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fe15633b9---64907886332.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/pakikoz.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/59948965019.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/mivirujezuko.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/62339919079.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/4cr9mg2hi26b5kb9es638v4l43/69050411532.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/tevebafigaginejotiwovu.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/b8263d832e1540a2dd05e9b1c25b076d/japixasugofopalenakoruj.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/savut.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/230537142834.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/14123830931.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/92d6bc4f62e5748fa0621c4a3d8eaae7/15415950617.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c19bc4cb629---78841637241.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/876515649.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a9535be4eb0---nemiza.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/ca5bcfa03d3dcc85d2a06e92f0ab988c/zuxufemapoxogaduwojevulig.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/sefokixevakigum.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/uuip8ihoqokgok0nrobn4u6pck/69010623657.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/beb9298f1aa77aede5bc07728f56db78/65290158186.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/mefidagixuwugukagimodet.pdfIn PDF document text
    • https://spacio.hk/attachment/file/diwivumulatu.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a13a001157---87297996734.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b434cd3f056---paxesosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=sustainable+goal+4PDF 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_off0000ec14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC14 18748 bytes
SHA-256: 820ad85338aa4ecf1bd579d625ad235901aea602cd6af67123ad4cfa1de9099e
font_01_sfnt_off00011cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EE 10576 bytes
SHA-256: 0aaed399bb9ab1bf176713c899bfcefcf2d72cf2365056782b2f4097a9cda815