Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e77dfaa1e7cd53…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 23:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e0b3e4aea903f19bc63baa3684b81353 SHA-1: f130e15d927a84d95d3fb0da52a01623c3446d63 SHA-256: e8e77dfaa1e7cd5395ebe2a9f099d21c3fdb7d25f4d263343913d0b8b512f1a7
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with numerous embedded URLs pointing to external sites. Several heuristics indicate that these links are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation.

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://ags-car.com/upload/files/zubaletivuxorupimebugijo.pdf In PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/17881756994.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614569873dcc2---40539656365.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/rakubura.pdfIn PDF document text
    • https://upaspor.com/resimler/files/bubafefir.pdfIn PDF document text
    • http://honghuibio.com/d/files/99087123081.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161517766015ec---17720762076.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/lipotosef.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/70877943707.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/zarujeden.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210906_A5A270B4A099E7F4.pdfIn PDF document text
    • https://webmanagement.colortown.ro/images/file/38323169406.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/xepimijafijomuga.pdfIn PDF document text
    • http://sinoorchids.com/image/file/popujusera.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/13969823289.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/57092935085.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/xuberopinuxumilog.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/64vr9ffo02gl12migg4n5fstbp/6203919919.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/13797722130.pdfIn PDF document text
    • https://pedrazzini-legal.ch/UserFiles/File/vafukikoze.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/44499344898.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/56018419804.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/50214569081.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130e048acbec---nadetukisigetabubudetime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=learning+java+by+building+android+gamesPDF 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_off0000afee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC805 11000 bytes
SHA-256: 6b95b12764a54ae1fc610185901bfc02e6205c747c2a3b103f616175769e85e6
font_02_sfnt_off0000e142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 15468 bytes
SHA-256: db858a16ce79d206e3b90b193fc2b91dfc3d65bc7c96febd187125ee143a57d8