Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc73a9c526d42382…

MALICIOUS

PDF

92.0 KB Created: 2021-09-08 21:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0351c67033af0c25d44763ef93504230 SHA-1: 4a39f60223af1e2eeb4dfc721915dd0b2d6229b5 SHA-256: bc73a9c526d423827fed5aa64d7d2bc90bc9d3eb1379a02a647a419a46c70821
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, 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 0.9973

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://philabc.ru/uplcv?utm_term=the+walking+dead+world+beyond+season+1+episode+11 PDF link annotation
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/16100646000.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/guvaredurarelowopanexexa.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/68585613360.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f9fa0a1ef4fc438435781bd070ed1b5b/nejoturidipuzugi.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/55080630165.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/63120979667.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/077bbcf84b28f41b4d74bcd041980ec5/gijevapezofajufuxubexero.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/muvax.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/zijuguvo.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/rumitomaler.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161376121315cf---nizesasujutunuvawegof.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/nijekevuxaje.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/8576624753.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/zanogatexizitu.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/vivebekofolakekuwijik.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/ketuxiluwobizuvarip.pdfIn PDF document text
    • http://pmke.cz/pictures/files/76484313623.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/12010361913.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/80454434234.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/jegenosijabet.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-06-12-33-47-79.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/2831001759.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b53beedc1724352d390507dd8e6defe3/firopeliledafufujepenala.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/zajijulegojudukuma.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/kosofulatamewizuz.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_off0000ffa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA9 18872 bytes
SHA-256: 3082a407e7dff35505fc0737385eea0826ccd571d9a53fd5a5ca39651ba0e185
font_01_sfnt_off0001309b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B2 11020 bytes
SHA-256: 1a74d4499ce87d8641da3a03300ac74368a4bd0cfed5a50b05c616021476ebf7