Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c736f1f39f1f7a5…

MALICIOUS

PDF

70.3 KB Created: 2021-09-13 17:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9a0441ff13e56f085213a8105e2c0e43 SHA-1: 7096abd2960e3dce142b9cbefb55d4512352dffd SHA-256: 3c736f1f39f1f7a5a1ab0ef5b69af31996a56e0ade79877e4c266643fdd98355
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also features a link farm pointing to multiple distinct hosts, some of which are associated with compromised CMS uploads, indicating a potential phishing or malware distribution scheme. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://empezo.xyz/js/ckfinder/userfiles/files/jufinuta.pdf In PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/bilunovanurupabifunuviso.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613432ab13061---minabexesumulodutojad.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///fakapo.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/sapesuma.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/nafamevagenasisulurape.pdfIn PDF document text
    • http://myphamasia.net/upload/files/kusitubojaxakovox.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/cd24gc55647qj8jvq37d3vkjk6/5238254717.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/juwesuwanupurirenitulaxa.pdfIn PDF document text
    • https://clinicscrm.com/img/files/ruzibuvoki.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161301c82a63cc---68721877846.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/vabitozu.pdfIn PDF document text
    • http://apcmagon.com/userfiles/17709101531.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/pifolapivawutupebesas.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/zuterakawenorazil.pdfIn PDF document text
    • http://podarox.ru/public/files/pozimunigo.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/516b77a17a94376efba395c6caa59752/93164098056.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/53219012450.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/mebovexuwozuvamef.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///62091051450.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/defujirapijitakawit.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/4fa56223b78dad6a97758f109e1f3c65/25815101182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=line+by+line+explanation+of+dover+beachPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/50641266945.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_off0000b351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB351 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB63 15444 bytes
SHA-256: 9c40d6415f8cbb90ecb61b869b382957bee174745aee44e2d6a88b8c89a9d233
font_02_sfnt_off0000f2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 10928 bytes
SHA-256: cf95b2c7e1e78009d85246550f8c1953c091724c008f16c797ab6c65633c7515

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