Malicious PDF — malware analysis report

Static analysis result for SHA-256 673c0c62c6f89587…

MALICIOUS

PDF

101.8 KB Created: 2021-08-04 05:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bdb488d34b167badf5f770bdd11e2cfa SHA-1: 58cdbbcba0caa80aeca2596afecad43f8de1eab1 SHA-256: 673c0c62c6f89587199c0b15653090d559ff84b9d196fcaeb0a18dd44af6416e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content or engage in SEO abuse. The presence of these links suggests an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://too.kg/wp-content/plugins/super-forms/uploads/php/files/f1d0007f66baa6e65a4b80eb794ee6f9/87255341651.pdf In PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/758891763db8eb7c878bb222925a4ad1/fotowajoxorokapuverajo.pdfIn PDF document text
    • https://digireg.pl/upload/9802904441.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/3fde43cb775b471904ecce5070d03740/mafinezosetup.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/a3c0510f60c54a3a8aecc8b5496b4b23/lerasofupamenidoguxaluko.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/rogitudusubexi.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/zenuxaxadevire.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/51056240823.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/zepej.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/7dd199981a0f556d3d9fec57fadf0d83/bumolumukamivumilagugef.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/fizitajisiruler.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0e60c9368---85504028211.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/bokilapixelisis.pdfIn PDF document text
    • http://wych123.com/upload/files/sadixetonagiwugabasulu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a50253fc7b---65825893340.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/serixeligo.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836698f30d7---33955147315.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/nimedinawapejitu.pdfIn PDF document text
    • http://wahiclassof69.com/clients/874294/File/12855059124.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805bf540d10---27575047352.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/wabavabe.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/08/file/nimuvanak.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/pokusepimakupevudoz.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/6432079162.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/pfu967im0l3e7kd2qo66dqlujb/bugovodaposoxanopakok.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759ab631426---mazixefobuwuburivilimixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=can+you+get+your+ged+online+in+texasPDF 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_off0001272b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272B 10768 bytes
SHA-256: a5bc06df33d4835db35cd5a379323a5007811534017ee689ecc43b83002ae224
font_01_sfnt_off00013fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15801 17756 bytes
SHA-256: 4b3a345e3af817cccacd45428c1c6396b11a9fcc8c2869675ad8e41267f24bfc

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