Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0ae264d51cf703…

MALICIOUS

PDF

86.5 KB Created: 2021-09-05 09:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a46b1be256f181f5b493c2c101640385 SHA-1: 9d80cfb7595fbece2680477f01a7780dee5af539 SHA-256: db0ae264d51cf703691614dbd27a1728307a2358c658db273ad6a8f6f8818d79
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://laulumaja.fi/ckfinder/userfiles/files/9276306726.pdf In PDF document text
    • https://zhansq.cn/upload/file/99367112588.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/38616067849.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ae33947a7---wemigosuwirov.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/1afce81bb4342a09d421367998bc076a/96202549754.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/32024817105.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/20856473636.pdfIn PDF document text
    • http://insureacompany.com/userfiles/file/63935755428.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/tawubi.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160801f984b168---juwixatanadodere.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210817011055_uvfpek.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/kojibodujawegejodomofas.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/61522071619.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/93884c8e6000adbe044e55f465e3e595/12488101828.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/gg0ofmvgdjnfuh8t1hpcjlbokf/nevodumizujuvuxusasidujuf.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/xigafu.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/75785387549.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160830083a765e---nafarev.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98001187270.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/58387266194.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/digigudipirasu.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/26087637678.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/visisixikofifej.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/6a9mg39l7t728h62uua3jndsrm/nixarenizituvifoz.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/1c84e2460058506c3ebf980ebdb17391/sigibavabifidi.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/97275847150.pdfIn PDF document text
    • https://teamcode.net/upload/files/25899131839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=rog+strix+x570-i+gaming+manualPDF 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_off0000e329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE329 20504 bytes
SHA-256: de5aacd8ecc6f349f950de59725de4a2f4a2e560c54de8723c1dae2d355d44b7
font_01_sfnt_off00011910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11910 10904 bytes
SHA-256: 98bdead5f54f49c362bf874562cc79bd949dc1d4229890c9f22474f64aaa0464
font_02_sfnt_off0001326c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1