Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cec95329778cd52…

MALICIOUS

PDF

78.4 KB Created: 2021-09-02 10:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1e51cedc0ccc4b66be0a077371f3d000 SHA-1: 09135aa3f3785ae5560e7197ae2c38928b635c60 SHA-256: 9cec95329778cd52d313db19625b7062f85f556183098bebbcd084f9fba0ecf7
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. This suggests the document's primary purpose is to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medius.sk/userfiles/file/xoxatulojepilukobiz.pdf In PDF document text
    • http://togul.org/sites/default/files/file/19436552333.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/38eb6ad625ca9f506f746e4ae9824332/51898673335.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/79915928436.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16109348595270---78254279111.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/jugemiwilopevizijatil.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/455c053d586f8a667d4128c5f3015575/gizezemapagatosozupilifad.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/d4rgjqbrg41287o8416bvoemod/32915399329.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/zuwibefikonefutupenanid.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/99627176213.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/kutebawakopepe.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/gujarefusi.pdfIn PDF document text
    • http://charivne.info/images/file/73204614261.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/23342670199.pdfIn PDF document text
    • https://songhong.info/userfiles/file/71445150761.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/ronokefexoles.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/pb50527mkrhkdcm8vmbtl26g75/23686762268.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070589336962---32014677512.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/a10cee72623227534fb5f1610dd173ed/12076505500.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/7654755156.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/7599707418.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/60153824396.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/kojarogugetamekoguleri.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/74199215780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=1+usd+to+colombian+pesoPDF 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_off0000cb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB71 18540 bytes
SHA-256: 6d66e02c148a77884df79bc8e213b00738bcb42f213de8d292938707566f9f93
font_01_sfnt_off0000fb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB61 10768 bytes
SHA-256: 10cff375667d20e6b73a74d54577df82e2a18970fccec4d0c8e8d0ff81526ed8
font_02_sfnt_off000113ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1