Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4dfefe6ef7b796…

MALICIOUS

PDF

84.7 KB Created: 2021-09-20 13:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e43c33ce9c8ad3d6856fdb143356ddb7 SHA-1: 588c0f26111bcd15363ba9ea3d9d25ca1691ce80 SHA-256: ca4dfefe6ef7b796cdae15d18a06fe11cb3fdb0f2dfb8c06159684582a880bc3
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous links, some hosted on compromised CMS platforms, indicates a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/bufuwa.pdf In PDF document text
    • http://jsjxh.org/filespath/files/20210908032309.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/45881304715.pdfIn PDF document text
    • http://malifer.hu/upload/file/70292993622.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613426ccebb73---50449824110.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/bovuk.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/7850338536.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/buxom.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/limumiperojirinubibepovab.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/10434338169.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/lazepajinuxabakijikumita.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/50371127537.pdfIn PDF document text
    • http://itena.si/uporabnik/file/67976513452.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/xidexiki.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/kamaz.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/xaferesuwujamurewariw.pdfIn PDF document text
    • https://academiesutherland.com/userfiles/file/bivemelememosaw.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/davenasewugomujalibez.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/wojoxarojitazabir.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/wekarurodareg.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/gigisa.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/6bace8224a47c69d52ad9dea180bf514/tewojobotupiditexeb.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/rikate.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/vivoriv.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/9711756401.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146238d20f61---43936362312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=video+chat+app+mod+apk+downloadPDF 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_off0000e669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE669 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7B 17840 bytes
SHA-256: 2c0b3d95f58d286b244e1480c5dbdde8793f177edaf7b1aad1f916b9e552af9c
font_02_sfnt_off00012cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBE 10656 bytes
SHA-256: d4b78930d5fcd318fdf5e2dfa721c2c4ae521b75c6faa80df4cc91043956cd91