Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6db1e6d665156e1…

MALICIOUS

PDF

84.1 KB Created: 2021-09-15 10:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6219f704a6050b860cfe814413aa7706 SHA-1: 038d8af65dc9cf143e5c98d1e137b5acaf1bec52 SHA-256: c6db1e6d665156e1cf2b4d287720b3f60adb74233d0b7d59736db39f8b8c42a7
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains numerous links, many pointing to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs and the link farm structure strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://files.ibiza-ferien.de/file/70262202823.pdf In PDF document text
    • https://gdaniec.com/upload/files/xozul.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/6268016760.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16133c035723a4---xodegewiluvivafasenuk.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332cc721805---gufis.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/livagoka.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/95946840812.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/59054292455.pdfIn PDF document text
    • https://maria-galland.ru/files/file/fesipemeza.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/76783926660.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/loparaxu.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/pawawewezadamomaf.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbce8e834c---61199769095.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/wapuvaxu.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/ludotof.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/56027757342.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6c4c1aba24dd3443d1b66c47bfc6c324/44888193585.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109130627533003.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/51810789264.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/totogapiwiboxijaza.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/18387817186.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/wexifa.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/9af3499cabdec6637ff43e217fa2e0ac/tijizudofararituridewites.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=best+offline+battle+royale+gamesPDF 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_off0000e252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE252 10864 bytes
SHA-256: b7bfa4ad89f71ca0e0f15e93c1521dab69aa224678b01de252dd88dfd6fa7cb0
font_01_sfnt_off0000fb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001138e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138E 18076 bytes
SHA-256: dbe7026cb1334055f98efb0f5f631b57d641422571209caadfa6c55a779a9ee5