Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3ef49f7fd1d9ec…

MALICIOUS

PDF

99.2 KB Created: 2021-07-24 09:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d6670903be0c3c0297050ab8035599b5 SHA-1: ffd1e563b7bd5dce18a2fb9914c6553c482ceb9b SHA-256: df3ef49f7fd1d9ec8f71332a873989c9139086439233a44bb50bc17e8f4e3cc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, with several pointing to compromised WordPress upload directories, indicating a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://quatanggiabao.com/images/uploads/files/74136348953.pdf In PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/viwetipabotebosifuf.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/ziwenivoromizi.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/94127618669.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160adaf850c2e8---25303113509.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/nevizugozenewizew.pdfIn PDF document text
    • http://gdaniec.com/upload/files/lirijugiku.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/40746614442.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/4828840284.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/voedc0mohhm6scm9637dvlgvno/36036445364.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/32190434682.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/natilogematofo.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/8a4c3golm2qshjkd0emcnm1s3a/newire.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16206247853579.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b610669d825---52344198596.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/zazegawugixawunemefibut.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/d7f09740e0600f917900f69b030f592d/69482088614.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967263eb5bc---muwifoxe.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/rizozolezetumeluf.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/8660934936.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fb0c0e0723a---rokitajol.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607062bb7d32e---gojijeko.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/mefawewimuvesogoxadowetat.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/c171042680b1e86c49c14962d779800b/80886028750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=paco+el+chato+segundo+de+secundaria+matematicas+conecta+masPDF 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_off00011cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB7 10920 bytes
SHA-256: 418c07cd1b80ce2940fe9cb1c52622a1b8c96ab19ffc9bd9f8417f35c7b9a6bb
font_01_sfnt_off0001359f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359F 18792 bytes
SHA-256: d49021bb0f4fa9f49093bb2fa3f0c45335c5e48316bd4e47ec8927235fd77732
font_02_sfnt_off000165fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1