Malicious PDF — malware analysis report

Static analysis result for SHA-256 0702929f23abc92a…

MALICIOUS

PDF

85.6 KB Created: 2021-07-20 23:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ba02291ab0f7885473bd1edb60a52f8f SHA-1: 1322592e387f4873fdfdcc0446e1b8d4e5d5a00a SHA-256: 0702929f23abc92a57c2632dc3ce6c498269e2a3efd77e705ebe848123018996
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or phishing pages. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, suggesting it's not intended for direct user interaction but rather as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://sendedianqi.com/upload_fck/file/2021-7-19/20210719031057328019.pdf In PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/92g5kitp51gprsiktoirckf13f/gokabajoxabufisujifakuku.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbadce7db90---wamizaven.pdfIn PDF document text
    • https://ebooksweb.net/files/file/45656192971.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/92d54f7cd52a155697a84a812ed46c78/vivomofegegobasazafi.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/eh3vaqoiabpfbnmaggctfj9s9m/20812217643.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/95244330491.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/sakimiledofofi.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609637988b4fd---30562903068.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/se2qh0picjugljgm6d25hc00c0/70787638442.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/rojigo.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/kozivonojalutipotori.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/a08083207928ab584ec042e405e1888a/50433815968.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/af206738676497d07422f16da78e2f32/mavep.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f0135ed538f---vetumi.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/64315433682.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/joruvugatodotivove.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/9232792f869006736278a5e0fa98d286/vewopabumatisoma.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/lojatowezana.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/80963022470.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/gosegolopavivi.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/kinatajiwirinewuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=dmz+meaning+networkPDF 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_off0000ecf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 10476 bytes
SHA-256: c57afac4c7d9abb468417f0380c52e48f91b2792894f766a2420628d7fbd1b41
font_01_sfnt_off000104d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D3 17140 bytes
SHA-256: 42c95836088773dd06cad14e8e4b60914a6b65055040c89ae5ad2c5e769f5fdd
font_02_sfnt_off000131aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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