Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33ed875b4e710e0…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 07:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3433b1cc378b3fd94fb606ef50f17712 SHA-1: d26d2dad26f76e992c9defe4a21f2e97b515622d SHA-256: e33ed875b4e710e0dabf05a7c3706e8e3ea7633ae56cbbafecafcf8992e0585e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress uploads and disposable hosting sites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://tahitotfalu.hu/ckfinder/userfiles/files/86652409715.pdf In PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/xiravesuxexuwazupax.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/xavevizivuro.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/90446772100.pdfIn PDF document text
    • https://dm288.com/slicice/file/69202166942.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/vifaxekakewabukara.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131707dd19b2---94863312196.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/fedaxuralupaxoxituw.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/41485367070.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109031937372856.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/gadoruwufanelofe.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161464b85755fc---misovokir.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/17755490246.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/41672073896.pdfIn PDF document text
    • https://www.suep.gr/ckfinder/userfiles/files/15878652522.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/61104597123.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/23184933889.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/sowoxom.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/fipurevuxobelubovuzoxu.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/44138066900.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/xegipatarosinefilag.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/88377527621.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///58511578833.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161331d37a2e82---68773349158.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/nudovazikazufazoperuwava.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/15236151608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=next+skin+valorantPDF 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_off0000deb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB0 19788 bytes
SHA-256: 17c1670b4ae3f8d47090be04966a0396dd3b458b047a9a88485f1ebc7ce0c700
font_01_sfnt_off00011262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11262 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A79 10336 bytes
SHA-256: 3000cfc9fd448e3d848b2cfd112181953c872f9034a0e0be342fa7d99f05506d

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