Malicious PDF — malware analysis report

Static analysis result for SHA-256 88de1134cedd0e9e…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 05:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 76409864a99093f8c313378985dfd102 SHA-1: cd8afaca13be0eed65d6a9e7f07ca42193437174 SHA-256: 88de1134cedd0e9edc64e1d077946305cc55c0f5d87429958f0bfa023d07f6a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm, with numerous URLs pointing to compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://wastran.ru/uplcv?utm_term=maths+worksheets+for+grade+ukg PDF link annotation
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/fc9t670p49l8ir8ln6k76373g5/20394675052.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a1793b22e64---sedolomagepadadawigevolux.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa62c84e1da---31156867038.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/jiwutedenetija.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/vhk2095uk9qm9i397n5pk9p10j/kafepepewolimid.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089972604f8e---jigivaluxipipira.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/junadababuxanilufovux.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/kamosadixifesaloku.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0238060b6e18a4fe30809a72ac2409cc/82830722457.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/jeguxepalanavina.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607587ce82678---sesut.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/46372844888.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/33e75494a199e568e441b99cfd7418c7/8719446101.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///lijusufawosegupefet.pdfIn PDF document text
    • https://thehouseproduction.net/file/nudobibovatenibus.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/3f3dbd0f91acdb6c986d45c603092c05/gujavosizevuzovubogorixan.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/42161825067.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/pilusem.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/65513006694.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/sarefarobexulufevaberedi.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/mugakotozalinimuvo.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/benipabudijusamozesif.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_off0000d6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E3 17532 bytes
SHA-256: 6a6d6a71580d5a8c5620efdc43fb70fae135d8fc66829c193a85b25168b97214
font_01_sfnt_off00010472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10472 10664 bytes
SHA-256: 030edb3a45e425148cc1472b946684fb0b46dea1f1f3349748cd940b4f10bef5
font_02_sfnt_off00011cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.