Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f135c46bc07fd19…

MALICIOUS

PDF

87.0 KB Created: 2021-07-28 08:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: bbf9382297a03eeea59b345d8b9d68c5 SHA-1: 8b97f28ebe909a3561e52ddba4ebbc73dd121aab SHA-256: 9f135c46bc07fd1938db47aa7ed8241bf511f7b09e45c0098c81037ffb1d489e
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 0.9919

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 https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/nged0btvd028dcbrbf5godh2ke/41031621675.pdf In PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609617d0db2cd---40213963760.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/cc0b60526df9b6c6e64e83aedab37387/fufob.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e1cf3db40983b4f03d2b1c72e2d1c084/81734583030.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/d18fa24245924bd993309d8c49ca6aa0/59999896713.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/33372ab24c2949b281e2d2697126743c/45475676576.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/48859689640.pdfIn PDF document text
    • http://peak-experience-japan.com/36574862253.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/4dc7ed40072f1277fbbf189c7f02815a/wimulipisonasa.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b96bbaaf39---tilenavuzuberagizexagoluk.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/93953f6d643c932d23d6b97b9ee10171/votazuritagegofujinuzomar.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/wiritepoxan.pdfIn PDF document text
    • http://abnicum.ru/files/file/94449119319.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/50bfb7013a6615605e1684534cca61e6/23200256352.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076b24250e7a---winiviwerebegedujoduxejad.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/0f43abada0e0e3d87208dc99da5b821c/julaximajabebopod.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/wewazure.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/zufatosefawugib.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/bc89a5a00b230546553f39be16118ffe/gotoru.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/d37968a8f2c34e9f11d3a110572f3531/lepatejizotususajafadug.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/lotazulepamawaradu.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/urs1kh9c059s91dbi5vhg7mer2/wufizisorafuloxesapu.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/45475520035.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/sezusaka.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/dd861255d2cb0bf8ba08a9c8817d1122/kakukixomum.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h8fs6rju2kah0f0lk4ealrqim7/nixuraziv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=download+driver+intel+g33+g31+express+chipset+family+windows+xpPDF 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_off0000eb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3B 17436 bytes
SHA-256: e80ce6c2c8c91cd3cd83b0d4be143cadebf0ed1c044281595a8b0e23106d892f
font_01_sfnt_off0001190e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190E 11660 bytes
SHA-256: 80f641b48fc04ee4de65a0208bc2bc6edd91299b1d208dc198ca727ac3ede463
font_02_sfnt_off0001349d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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