Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf4d0bc3490ee5b…

MALICIOUS

PDF

78.9 KB Created: 2021-09-20 01:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db4aba295b3519fb86ac06f5ef35e152 SHA-1: 1171d0616e86b9a5a6c327fe9bc83fbfc67bf7ed SHA-256: abf4d0bc3490ee5bc83a1ee70665ba623ff5edd67c1f09918d38866a0864df70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that function as a link farm, directing users to various domains, some of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://laborke.ru/uplcv?utm_term=best+games+to+play+with+friends+on+ios PDF link annotation
    • http://ndt-ultratech.com/files/98061256498.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/89235982849.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/renoduxone.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/91594905964.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/sisuzibeliw.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/zogubuxigojapozi.pdfIn PDF document text
    • https://ksboutlet.com/file/files/xezepavitufurozagoluvof.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9ce0f4a81c25fcfb70df1785179c38ff/15373958163.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/79283062374.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ed8c41525---mimazex.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613439d7e76f7---fofojeweduxedif.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/dizipedak.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/73898785428.pdfIn PDF document text
    • http://batistar.fr/userfiles/file/70002122213.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/11279524007.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/28183414035.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/47491033113.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/5c2ce6aa481328e62766c606b2625278/sizunikuzewukakowafaf.pdfIn PDF document text
    • http://ed-union05.ru/files/file/dibuzivipapix.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/movadidapava.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/gisagirarijikukizu.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/90985675011.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/durixe.pdfIn PDF document text
    • https://stopserv.ru/files/file/71685014698.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/30be75d4de8e7b5985eaf4d425015697/66508341637.pdfIn PDF document text
    • 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_off0000cdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CA 11200 bytes
SHA-256: ac7d3bdae5bd2e4241016a9278ffcedbe521a92b5e66157264a8bb65633bc145
font_02_sfnt_off0000ffb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 18028 bytes
SHA-256: 0a05693fdcdd406c8f21c98830c9d49a0a4214a71b7950b810be008a55ce1dc9

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