Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba61093ff8594fa…

MALICIOUS

PDF

87.8 KB Created: 2021-08-05 18:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dbf2c5f3d93f29c0beec2efdfd914034 SHA-1: 9e0307fb13607413c4b46d7bd253b1c6e8fc1a0d SHA-256: 5ba61093ff8594fae4308590af084a3591deb2bef8c32183714b0dde5622af3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://nomylo.ru/uplcv?utm_term=como+calcular+o+seno+de+um+triangulo+retangulo
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/tafifatesapubenobas.pdf
    • http://argyleliquidations.com/userfiles/files/9573657068.pdf
    • http://aci-immobilier-douai.fr/userfiles/files/rujapefixira.pdf
    • http://transcash.com/ci/userfiles/files/68277159931.pdf
    • http://tangiahoang.com/skinkorea/Images_upload/files/gusefonor.pdf
    • http://wellnesszeewolde.nl/site/data/ws/files/xejumelitedewukonasi.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d58017f1e6---70331258408.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a893f054f---28938778850.pdf
    • https://nusbetaja2.com/contents//files/47644159385.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160d84c8bdc02b---45715549032.pdf
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/kedigibejil.pdf
    • http://x-site.by/upload/editor/files/1935872531.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2a0bc468f---89674148693.pdf
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/fefepudofadan.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785413dfaaa---79674219796.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe4b438f83---gezadozokugibomijer.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15759c9cf9---92292587389.pdf
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/setipodajimojizez.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ad1b6edbc---zanelejozegenomuvobifixa.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa259eda30---47504247248.pdf
    • https://plagij.at/ckfinder/userfiles/files/josijodilemifaniro.pdf
    • https://srldirect.com/ckfinder/userfiles/files/33148163978.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2f4atisnkgvdputsmtv4vr9fc3/kapexunalewipugewe.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cce206905e5---25342029158.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 16792 bytes
font_01_sfnt_off000106c9.bin
a3fb758952eb7ade13296d6bceb84ad2e390f3e4d7950675b5094559beb728fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x106C9 18976 bytes
font_02_sfnt_off000135d4.bin
99f0b591a7b9b3ef293ef074f8b6ca5dd5ddbc09c27c9dea2d811162f6f7a480
pdf-font-stream PDF embedded font (sfnt) at offset 0x135D4 10844 bytes