Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3cd3513a43b5ab7…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 01:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: de014d16b421fc24e8a6b783f57a48bd SHA-1: 9ecf380dcbf27f5bf61ccbe8d3a8f04e4ccf748b SHA-256: e3cd3513a43b5ab71dc40572261c71d7f1d3928f04c15ac6b5aa34bce950a73a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to disposable hosting and compromised CMS uploads, indicating a link farm designed for phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

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 http://ashioke.com/images/library/File/97580003299.pdf In PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/90598303283.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/jijesudilugolaxuwiwirireb.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a743186bdd4---bapenakukotade.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/kuzagojuxorobon.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/91715846954.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/48436609526ad8188cb64a49833b7a7c/kafifajonut.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/sekabizuvizisisopu.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/favufufonefelolu.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/96805103195.pdfIn PDF document text
    • https://kede.org/userfiles/file/15688745831.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/lipivawan.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/25739221297.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/48716077110.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160902841001ac---24367796583.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/64351510060.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feb3b75bba---26854360404.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/garevanemawamigawawawu.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c40fb89ef---76770562011.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609466a44cf88---zabixokivi.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/zaxipe.pdfIn PDF document text
    • http://e-sportis.com/images/upload/minitabigedenifiz.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210812122159_174289384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=make+a+girl+fall+for+youPDF 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_off0000ddff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 10320 bytes
SHA-256: fa59e024ab46d0d11e6b6d10bfcb08d4e3628de7095fac5c606c6aa376c33073
font_01_sfnt_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D78 17912 bytes
SHA-256: 32cd2af3a89ea332a7904b67ae7c5ca1b4b8d6355a07a764be88c9f6719f8b71