Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68d1db201c13e60…

MALICIOUS

PDF

90.3 KB Created: 2021-08-08 08:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: fa3b33e626c83ae0cefac0fb947179e0 SHA-1: 55f0df625d5d6036f2a6a51e77a49bbc2c6f1172 SHA-256: d68d1db201c13e6018cd02d2a8185653926cb31aeed7e07acd04674f9ec14f63
164 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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://iwort.de/userfiles/file/fovodufazegivotumi.pdf In PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7182e22fd---lixosovaxabobud.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/wewatojiramuf.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b28e3a4fc13---pitufo.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/5318994720.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/0bdb56a419f1aef5d14d712e2c5e062d.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/57d01420ebc08bf4de1507958148dc40/foguv.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/69623483e76df776944394c2a0f8604a/86635150771.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b707a752d---76658457089.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2482d2bd7---rawud.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/nasogipiviraxapozolaxige.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/82155898396.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608995fee6f55---xefenumonub.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fufirewo.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/robibureboronexutoge.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b25f87ba52c---79721107494.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/96ad98b38d4f091fa5fb4c047d5786f4/38379100504.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/34202950932.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/fiworudizaxevi.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/fusefaxaku.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zarofawunomag.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/80846773657.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b128e8d5aa6---muwibarawulekovabe.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/06ra61n87fve9dgb5bs29u77up/lufepijupelunenaz.pdfIn PDF document text
    • https://hojoairport.com/images/file/ragip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+recover+text+messages+from+broken+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 11248 bytes
SHA-256: aca56de5dbd3dd8ccaaa84cdf484fc81a843f0bbe993f1695114ffcb8563e6ed
font_01_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C4 17356 bytes
SHA-256: 6e48654cec031c640ef034336f9f8408c1d2fba3b56012c3b073d188cfb109ec
font_03_sfnt_off00015204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15204 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13

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