Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7cf2e2dc35cb12…

MALICIOUS

PDF

102.4 KB Created: 2021-09-06 00:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8307ffec199cf5c7c4ad2396ea15d782 SHA-1: 194b1beadaff3ddd78675724a0d390d4421b6955 SHA-256: bb7cf2e2dc35cb121143cf92782db2537c53cb4e61506fa44992167e783631e3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c937392bd7---lesoj.pdf In PDF document text
    • http://rilta.net/userfiles/files/52024677824.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/wojikixox.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/11048870218.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/iit1njdjp352gafb2vni3fbhaf/16593504769.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/cjoug04i03opr0tbt9qmh7kjl5/gelomaxetutizutex.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fef60483cc---83704098379.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e900bcf76---5554611672.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/46aa37a906ede59b100351cf5b2d72dd/77685492898.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/1096969474.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/menevan.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d185359fc14---gogadubasilorevu.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/zemonexijomod.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/90722247230.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3f511d459---12254752029.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/57745933390.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/9932e29239aa3c457a710b20df862250/pipunanonutapax.pdfIn PDF document text
    • http://adveotec.com/img/file/mowoxak.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/6itu8hhuqms9ops69aou0bmq91/98180698748.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b5952b1d4d486832b34c9b701a4fd1c2/5277975826.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a41216d6b---wakatigulexoruriridis.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/sunaboneniwuga.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/55415903948.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/20902140607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=mapa+da+cidade+de+luanda+pdfPDF 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_off00011eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB6 10220 bytes
SHA-256: f24e4ccde914b602c5823a644657375836105dc75f6e022179547ca83c5f9df3
font_01_sfnt_off000135ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DBE 25288 bytes
SHA-256: 19e19547be476864573cced34bf3cb55f04adec5290d056811c33383b67ed815

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