Malicious PDF — malware analysis report

Static analysis result for SHA-256 97905a44ca5abaa0…

MALICIOUS

PDF

87.1 KB Created: 2021-09-20 17:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aec3e3ae177ac27697bbf531c21e3984 SHA-1: c7c0cc65ed8e0bdd44bf515138bbb90f316af6a0 SHA-256: 97905a44ca5abaa010dcc27a39105a7f4c4d235d7fdf1153522e65b6cd2cd7fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users through these links, likely to a phishing page or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://synerhu.ru/uplcv?utm_term=psx+ps2+emulator+android PDF link annotation
    • https://expobar.vn/app/webroot/files/images/pages/files/91848354253.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/39419560148.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/293340319b87d01233dab864674722df/86238429431.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16312656551195.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/duboresujabobenaviwagem.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/rubukupukikole.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/93152147151.pdfIn PDF document text
    • http://giga.sk/storage/file/26730003444.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/luvatupenedojuzulazuzax.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/magalifuxevelogum.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/16071569884.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/49646960340.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af00797e9---4306667217.pdfIn PDF document text
    • https://atiksigorta.com/files/62632000052.pdfIn PDF document text
    • https://drlanda.hu/user/file/23267274564.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/95207dbt7trtbcjjm1o76j9l79/1844015516.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/7542498187.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/nigovozobupekibivixanore.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/simumikinenarifelus.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/bevedaseziwo.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ec6ad65f16a54eca7b9ce49d2ab48f36/30660234493.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131831f12ba5---nikomekimekevurivigotojir.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B6 23416 bytes
SHA-256: 929d76a60fe91bcb1274e78e24d23c58e592ed8cbf5a27111a279c0e5b2cc90c
font_01_sfnt_off000114cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CD 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off00011cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000134e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E0 10876 bytes
SHA-256: f17bf903dbbf716fa050a2a0cfb8127fa304e94c8f1fad43223662909d92f798

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