Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a970d884a9e70c…

MALICIOUS

PDF

120.1 KB Created: 2021-08-25 18:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: e71db21aa9fe14f6aaad8bc137aefc5b SHA-1: f7356eb76c9568a91663d29125ea76489e593928 SHA-256: 13a970d884a9e70cf0dac90174858ee77bf0eb866226c5be18bb7b90e6efd3da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/kuppn2tfaokiq1blabn5lu92u2/gifawigajenidapizika.pdf In PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a04352391e---torefoveteriroxawipe.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210630_DBD4606C31C53ACA.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/7899153934.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/33262834430.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6291fa656e---35069659781.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6026cb9e---35449894486.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d2ae38432a0f7f699129892a026675e2/18730327474.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/57775163510.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f673bcc880---jixatonejesedebuvibegus.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fd3254348---61933307580.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/96003637252.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/5820fcf73cbd93ab33e15a289e154655/goxirofadavajatafa.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/39960635903.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/xutaremaboguba.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/lumubejar.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/ebde500e66c403ca5eb3893f6498799a/97014479350.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/vidaf.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/87989763d08549a0096d2d60c56bb96e/33095881677.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/xozebiwiwojizu.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/880745fc3d67b782d5bbe345f94ecea1/vebadakusakepasiro.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/u79ad4dj9cmin9hh8v2pbu19i6/93729209419.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/36186439320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ion+explorer+extreme+manualPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/34199834699.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001579b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1579B 10308 bytes
SHA-256: 37df1b6239c09c9865bcb8b5c41dc77aca798aa2abc38fa07edacfd9c4aa5069
font_01_sfnt_off00016ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ECE 16296 bytes
SHA-256: 0386a1c13e6e24afeae3a6e9ab8ec32f3cbcd5598a0e2bd3099080bd2aaca191
font_02_sfnt_off000184c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184C5 19700 bytes
SHA-256: 15d797cbf259b003fd291934eedc7f67427978f388f817014a445c94c3e79272
font_03_sfnt_off0001b8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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