Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d603c0f45d0245a…

MALICIOUS

PDF

85.7 KB Created: 2021-08-14 16:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e39127fe1d44c9878e8e622d17ad6d8f SHA-1: 111078ef0d4cd33d73db1bba0aea4016648748d2 SHA-256: 9d603c0f45d0245a91b33e3fb44875522ef4a697d2fa5b7a1ad5449272146ed1
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://queure.ru/uplcv?utm_term=foot+to+meter+conversion+calculator PDF link annotation
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9c7474711---vabejazububup.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/gosorumesojunonok.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/wixilekediwupir.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/binuxalaroxobutij.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/xosuz.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/buvitat.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/bsf3vhfb9om5jbn0aernucvoji/66129401398.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/bafeluwufegivabado.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/1rre6856n5airk2vu0nkrcr29v/pasemamojovokamibujisofa.pdfIn PDF document text
    • http://jngf.cn/files/file/99947695472.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/kuwegasowidaporubumaredid.pdfIn PDF document text
    • https://arerp.kr/data/file///44982006277.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/62cbd2c10c730a90deefc77333173f62/wamovigolanegal.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160fa184caa18a---88142639117.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/jawuzojaxalekasupovixoro.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/b4bee62c757aa189e62aa75506976a08/joxowipuzegowulegi.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/53072605555.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/83552294947.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608655f762356---luxejeratudutezarod.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a3a7ec174a04cf6719919ae727a7ca9/fuwaterubow.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/rorofonikaxojifakulag.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/jejomegujozorejubulo.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/7b9e8rcnegsoald6saqur5051b/9666906690.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_off0000ef33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10745 15944 bytes
SHA-256: 0cc6dc03492c45c70f2582b9ca2e057cec825b8f43f44e73dde5b0eb54f067d6
font_02_sfnt_off00013037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13037 10536 bytes
SHA-256: 79851627c96f3e8722aa8851db8f398323442434ec85cfceb836dd2ac878b3ef

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