Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27669b0ec11290e…

MALICIOUS

PDF

73.5 KB Created: 2021-09-05 10:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: de3438a94ac59fba59d88cb9df8096d6 SHA-1: 1ca859b75151948acac60fcc87f027b65c1f0f51 SHA-256: d27669b0ec11290ec339489f056f03ee19e1e40fc0ac18da395617cff6b02dcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/d688b07bbabdfb78c9116dbe17c2b28c/kebononixixul.pdf In PDF document text
    • https://hzautomatisering.nl/userfiles/file/xigagofuzamudiretedadem.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099300978c7d---kikesat.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/mikodimeloxufavej.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/dinekejalopivimadujob.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/3k8ttkl5qsa8junvqtf9hb0nc0/fasogomamese.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/padifotunevogi.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/tenumawakox.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/pogewazutunagogod.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/wemazobitusozavopisoj.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/32259127514.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/luvalaz.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/osl0eag1490ejpcfg2c73g3tm7/juxakewivesezigorawam.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/13934284116.pdfIn PDF document text
    • https://schmitz.cz/res/file/72388395947.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608321c8d6a61---2427166592.pdfIn PDF document text
    • https://ka-base.no/images_content/file/18043855124.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/mexasujenedosag.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/rovezunuxa.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/piwizezupuveribuk.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/e0kbk3i0ivq12i6ltm3v95tnuk/pudodimijidoxinanixobiz.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce55b1a983---62816690693.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/d762527a70c048adab4b47733ec9b8b1/buloroguremi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=rajasthan+vernacular+architecture+pdfPDF link annotation
    • http://irodori.kir.jp/files/file/dafewutabivubupejuladusa.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_off0000bafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD312 10936 bytes
SHA-256: 8fda0505f4a3dfcfc8907afd861d9842bbf393b77257bd5f93e0ef94232fa92a
font_02_sfnt_off0000ec5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5B 17080 bytes
SHA-256: cf31c27e6f3acf16394922d396d3ed51fb446ecaaf27b64f46212ba8adec1c7b