Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9fbc5505b2457df…

MALICIOUS

PDF

71.7 KB Created: 2021-09-12 12:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4ff3c0e84d8a7ba707c60db8d67b6319 SHA-1: a22d44c4024c04f1d94e562a445bc6346bbb43b5 SHA-256: f9fbc5505b2457df84b95e3bf740a6c855d81873ffd89d86ee54afa9f80950a3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites. The presence of multiple link farms suggests an attempt to obscure the final destination or distribute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://hzkontejnery.cz/ckfinder/userfiles/files/tadubuxawojerosoforel.pdf In PDF document text
    • http://el-master.ru/userfiles/file/10162890081.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/73949455506.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/mepegukijedizo.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/47544882987.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ciclfi39o22f0afvu1ou2di5n7/xewumujemeto.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16133ff3d394bd---kijapoluwaligefix.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/23014568503.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/93383288640.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/88601577851.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210902_3D15915BDB5C757E.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/legowasojaxigexab.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/bewebaluvuwidu.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/11898006064.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/27581188920.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/30372107933.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/lokugefasiwapo.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/wekezisizojakuvotabafir.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/89729292786.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/80373022626.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613333bbcf52c---70654741348.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/razifeni.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/ditezupapatedo.pdfIn PDF document text
    • http://recviem.ru/img/upload/51361193043.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/gebudozalibikufubega.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/xuwimed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=stop+chrome+notifications+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_off0000b769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB769 10912 bytes
SHA-256: d8ee0e41dc10ffc8bffcd6e2e29e4befabab0fd540d5261f0157b4deede694f1
font_01_sfnt_off0000d076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD076 15816 bytes
SHA-256: 90f50c0ab379062ff0e217dbab5d58ed6e64766037046b6f6693529c3b2ba531
font_02_sfnt_off0000f8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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