Malicious PDF — malware analysis report

Static analysis result for SHA-256 26907fe9cd8b8e3a…

MALICIOUS

PDF

77.7 KB Created: 2021-09-17 23:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 66ba72b9b616055997ae2210f04d9db0 SHA-1: fd85320534ed64d23c9b346013346bbd9fb887ef SHA-256: 26907fe9cd8b8e3a905e9317b624011cb1d8b30f64cd2fea5ce3c1913ad7ac55
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The heuristics indicate a phishing lure related to a 'free YouTube video converter' and a compromised CMS upload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a phishing payload or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 9

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://palami.by/images/file/82730232107.pdf In PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090315481880.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/29308208416.pdfIn PDF document text
    • http://bjjiffy.com/upload/51186722935.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141f0e88c135---73904616569.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/bofomixikapofakovani.pdfIn PDF document text
    • http://status.cz/UserFiles/File/xinasatojikoxakevopojomuw.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/11718160704.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/91015543568.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109111457357256.pdfIn PDF document text
    • https://wittnebel.dk/file/duxereregopog.pdfIn PDF document text
    • http://kelvista.lt/images/files/94338736000.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/62629596599.pdfIn PDF document text
    • http://elitvorota.ru/f/file/xabaruwafifixun.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0a208f9d---52764665246.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/7044932323.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2bed26bf8---91298798297.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/zanupuragadudadebekogeno.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/359172244.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/11631590655.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/q97q8j4hidb1ik5gs15inhaf80/sidibozefurazadodojivubap.pdfIn PDF document text
    • https://comfort8889.com/upload/files/bafapogevuvagamipeliv.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210913_6A8C6F4B5B267C5C.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/peguvo.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/3ae81c8b55d4f83ae27902b2a859d2d1/lilomejuwebi.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/sexaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=free+youtube+video+converter+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_off0000cbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDE 10652 bytes
SHA-256: 29d07eaa49c2c997bf550d1b2e305f90dcced312fdc91d3bc97549ecfb1e9a10
font_01_sfnt_off0000e468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 17196 bytes
SHA-256: 3f1febfe5b90e6189714d839907efd3332940b4d72a268663d585313681db1a8
font_02_sfnt_off000110ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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