Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f8b5dec3dc4b2b…

MALICIOUS

PDF

107.5 KB Created: 2021-08-07 20:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5c36e1812fd6a52fc4726658763bce15 SHA-1: ac2266e7ee9fce06bf2a93e4337efc338c73aff9 SHA-256: f8f8b5dec3dc4b2bd394b603bf5959a002eb195e718b19f5fa7683264969a106
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to execute malicious code or redirect users to phishing sites. The presence of numerous external URIs, many pointing to compromised CMS upload storage and disposable hosting, suggests a link farm designed to obscure the ultimate destination or host malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://philabc.ru/uplcv?utm_term=form+ds-11+instructions PDF link annotation
    • https://museos.comarcadelasierradealbarracin.es/ckfinder/userfiles/files/39870226978.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073ac605e392---21983438584.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/likoxagelodipal.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082eefe3c2d0---kegusevazagixezutariwefap.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/babunekororasimozinefisox.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69227681881.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/welideg.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925eef899e5---52447967449.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/ledeke.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/89428829918.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/om5oi386irf12u0k76kb76l78i/jufugofixubiv.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gujejurogafe.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/fe2d102cd44c2abfe0f6fefb14d30436/tijibaz.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/vunifanilewamipo.pdfIn PDF document text
    • http://amdind.com/userfiles/file/84630693154.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/m5o87i5cq8qlk9kjgrg4nbm7ae/gigimanoxu.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/65440860460.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078955453498---56095380954.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/suruxatijima.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5no5a147pdvprsbd85bdbnlivb/ragim.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/pesebilunidavabiregalizon.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/wizamizonorala.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/f2aca859520127c7bb06ec3dca150507/badigot.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/75833664879.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/77827325961.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/34138815357.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_off000142d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AE3 17204 bytes
SHA-256: b9dc3ae7ff5247772422c4d2873a42ad4dc6240a78b70896a1e2d92420c14559
font_02_sfnt_off00018797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18797 10352 bytes
SHA-256: c5d104513177bba96f00fd7ce1ffc87b3db0c2bdd3ba88097fec9a0cd339f7a9

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