Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0af3738ce04f8f0…

MALICIOUS

PDF

84.4 KB Created: 2021-09-14 07:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ba4619474c01c77ff5d4561b9f94d11c SHA-1: cbf63b899c59f4e8955c085dc18eb36908fada26 SHA-256: b0af3738ce04f8f093383674cfbca19076af62e848532980f55a97c2be3a23b5
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or delivering a second-stage payload. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ibeguiristain.com/userfiles/files/nuxesometadomevasugatexal.pdf In PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/vagewabuduwomegewijuda.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/51213920196.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/fukovowawoko.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/20041084679.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/neponabuzig.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/bezufujo.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7cda2d8a2---96421688639.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/70523005523.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/nadenosefimonetomugota.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/89852d8a7808096dd712e11cdd62fab2/20147358970.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/zabomadeku.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/xumowiwebidozer.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b586f495fe---98308464560.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/sonomevonujuz.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210902_A5ADFEE8279CDED9.pdfIn PDF document text
    • http://kvrhousing.com/uploads/vawusun.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/lesawujezetupevanodilupim.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/jizavefefakirupuzin.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/inuter.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/55200001869.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/81319556874.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/duwolijulikuzozoma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=chiudere+le+app+su+androidPDF 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_off0000e4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD15 10520 bytes
SHA-256: 1e1d7b4656678a1a46929558345fc8909925f966a5bf19bd1a604e25367b47d8
font_02_sfnt_off000114e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E9 18012 bytes
SHA-256: 7d599c608b3d982dd00baae2a632ffcd518efe1e0beed2b49a1fc291d6b40a77

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