Malicious PDF — malware analysis report

Static analysis result for SHA-256 16dbf108db9a1e86…

MALICIOUS

PDF

82.6 KB Created: 2021-08-21 00:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6840129dbde5e0af3cf99bddb6d046df SHA-1: 9816491944efbd65f59742d014f8f11ddf98379d SHA-256: 16dbf108db9a1e86dc684b296616214a9475014269a1e0269e92c4937dbc37b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate the file is designed to redirect users to malicious sites, likely for downloading unwanted software or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://medvor.ru/uplcv?utm_term=download+kinemaster+diamond+tanpa+watermark+mod+apk+apkpure PDF link annotation
    • http://progfin.pl/userfiles/file/sewemugakafolopomejimepi.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/rexetotukizexi.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/031002433472.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/mutijumuse.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/pudosowemedoxagobalotiki.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/36738091347.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b36431d11a9718ccf41b565efd407348/16292093742.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/ziminusupajomirabid.pdfIn PDF document text
    • http://sartor.ru/upload/files/libidofipo.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/mizoditutegejuxi.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/lenatam.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/37040249697.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/zuzelolideze.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/fcd6f49cf9aebe9788c20fe443e73cc2/81128289957.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/08/file/xofar.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/28063599688.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/14149490488.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/xomejediwapowovo.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/tofozisakujin.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16119fc0ddf509---74385942168.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/25932317388.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/viwogawubune.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc0184d9d9---32931355350.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/cf4cfbf05c9158b31d23be22169686a8/vizubuvevura.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_off0000df6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF784 10832 bytes
SHA-256: 39c2a3544a27b7fa164c98ba889492253b93cee86973aa7048b8efe8d0c89c59
font_02_sfnt_off00011084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11084 16708 bytes
SHA-256: 5aee8707a9e032c1b3083cd0170bb821be857bb3f6495f183d6c666e760a62bc

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