Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd5c59d3d47077d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 03:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a9005f9ab0e448c8406bd069f3b40279 SHA-1: 052e89b82b4badb0571d7f6d15d2ca2fa6346459 SHA-256: bfd5c59d3d47077d060937bea971b3c13b8d4da75848dc0b15654ae8f2870a9d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and embedded URLs suggest an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://abril.pe/wp-content/plugins/super-forms/uploads/php/files/mko37f87oughfd6b8npvm7t97f/26231671962.pdf In PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/xubefijokakixalujusaj.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbe359fd28---9091005625.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/97910134704.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/93169368287.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/5729236123.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/98320119466.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/4664616878.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/ketidaj.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/raxejigilikobiseno.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/44631701749.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210911224549.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/mutavunazas.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161455ee628093---71928172581.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/0a37a3ef9c96256db6901abd4ccde1df/21938930809.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/jizagaralunujofajujiw.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/4636176467.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/kavifesivajimag.pdfIn PDF document text
    • https://vestol.bg/files/file/64840031713.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/22822794835.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/gulabiwekotemodesa.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/kidiwe.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/rabezumufuwixivawu.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/guwamavowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=watch+the+kissing+booth+2+putlockerPDF link annotation
    • https://lapdonline.org/file/41107037548.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_off0000d381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 19492 bytes
SHA-256: e9e886da97a3699564e69a0bcbf9ba3dc90a363d4ff3ee531b54a6b0798f0439
font_02_sfnt_off00011e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1E 11100 bytes
SHA-256: 11492289f44f46f95adfdcf812330e74635bfbe664edc75de01f9f5a4ebfd9aa