Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d18d1fcdaa7f545…

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 06:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b6bcd53bc6ce5f77f2514b52e1698c1 SHA-1: 01f28bd73d613d86d60f677b3c1f3df093e8ef6d SHA-256: 7d18d1fcdaa7f5453a6b32d127ce6b794bb722ba1f9802027f2e841f1ff81487
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF acts as a link farm, directing users to various external URLs, including one that appears to be a phishing lure related to 'pay or quit' notices. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=what+is+a+pay+or+quit+notice PDF link annotation
    • http://llux.vn/uploads/files/16460644844.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210526074140_1763192878.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/puwukabazineni.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/gapigorijibuzene.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608124ef8c255---13857243216.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/bumamifomuduborefo.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/dofaramirilanopajegegoz.pdfIn PDF document text
    • http://www.puhito.hu/uploads/jelamirelemebakozol.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/perejelafapudajor.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/50232770487.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/19351199156.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/82988945939.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/nefuwevaponidukapejiz.pdfIn PDF document text
    • http://liyangah.com/Upload/file/sadinanamimu.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/virudejapopotutiz.pdfIn PDF document text
    • https://avenue102.com/uploads/file/xazapunazutagat.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a898246220e---48863675046.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f529c3af843---49625225543.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942c5c1561e---70799819430.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/55223698244.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/rrlqloag3cjpb2ijptnnkpjah1/mesuxulutekel.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/51009753190.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860f1a1d82d---wiripivogofusoziwu.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc72805378---39983919412.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/piveworexuwulasovoduxo.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_off0000da67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 17568 bytes
SHA-256: 19b4ff7f67e693dc75f11cbb844e67bc418e83d754ad9908257db4fe84b0d64b
font_01_sfnt_off000107c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDE 10776 bytes
SHA-256: e1053663799001f53e0024505ce55e64a760c07b910624ecba6345ef5a5d64e9