Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf43a047c2aebc09…

MALICIOUS

PDF

93.5 KB Created: 2021-08-11 00:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b9f0f2ba3b170890a6b32063f1a40d13 SHA-1: a01595c25bea00c84ab67f6021529f7df8b584bf SHA-256: cf43a047c2aebc09001c6e7263d214ee8638ec80a34d8276ff66add52d594484
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://ludifrance.fr/userfiles/file/notidokotolu.pdf In PDF document text
    • https://eternalbliss.net/file/19300175718.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16080649ce97f1---varabugapofakexoduxot.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/60341707684.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/kurivuwimuwirovovok.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/565cf8e920ce8fc423cae8edbd279f50/69415484800.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111c8e4cf065---40676170985.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d253988ff8d---xumin.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/96920095725.pdfIn PDF document text
    • https://btegypt.com/file/67643477194.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/buwuzorumimomo.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/4d1e86cc74fb1467e8e3c3388d8e2ca0/48655464071.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/90627032149.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b49fcd5bf---6519008019.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607502c3227d0---sakubobise.pdfIn PDF document text
    • http://change4best.ru/upload/file/kedowofapefalabop.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/jugob.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/denepewosad.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/vibefipademinebugufek.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/feguminoz.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32008734091.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/68526399049.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/gixowoguv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+phone+auto+rotate+not+workingPDF 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_off0001076e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076E 10716 bytes
SHA-256: 4dcda11239f9a1fb86d7d42711efb2a7bce49b571b4e358ce69080ab1980ba9c
font_01_sfnt_off00011fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E5 18108 bytes
SHA-256: ca1680985add1daa790f7eae5741de4a4e63126503ac508302282507387105b3

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