Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ff5ac227faad83…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 18:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d642a097cee79e93c4db4c1e1abb1225 SHA-1: c3b1dcdbfbb5bcdfef0cbe097e18f34487850f47 SHA-256: e3ff5ac227faad832d3d2d9c36e7a7605a90aebc6fcdb46b74c3ecb3305cf8a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links indicate an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://autoneza.cz/UserFiles/File/32932848928.pdf In PDF document text
    • http://roletyhanarol.pl/files/file/kofasujozidoriz.pdfIn PDF document text
    • http://handgun.ee/media/file/mafotinasoromemo.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/perebinejeg.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/xovugaf.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/sojisamujapesiraruwosi.pdfIn PDF document text
    • https://equalland.com/uploads/File/muribemegubozumob.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/89953597771.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210904235721.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/4711851744.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb6c9ac1a---55670069694.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/stmvn9inln2dlpmj8060lej2li/20052405680.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/woduk.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/38143820932.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/37042733529.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/xilapu.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/30197143598.pdfIn PDF document text
    • http://arsvet.ru/img/upload/20434665650.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/efde1273ac326d65befda4b268fb0fad/tanofilufugu.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/aa4e406561fd13cd22d8ddc457bc3283/fatimabapo.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/sawegonaxedaxizolefojova.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/kirewo.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/627a2807a8f8cb39b86f290cdaf1eb50/6764588407.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f784a5a04---69019893649.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/pifovapupodixipitulilux.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/fa2a2af0059d4d162a82be9782b8555d.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/71247102416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=best+anime+wallpaper+hd+for+androidPDF 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_off0000e315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 17436 bytes
SHA-256: b4fd42024aa389563b00e7c6737d9724fc4acf385f3cd843140ff9c21b80ceb0
font_02_sfnt_off00012839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12839 10904 bytes
SHA-256: 90e4e9ae59188adffc3514f4c8001199e73899b59b3a9dd9c05f8ce848f6f976

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