Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8178f9fd3795095…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 13:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4aede371e1497c3617af3c0843e4eb65 SHA-1: 3223697409fa58343e661786b1a173ca9d50714d SHA-256: c8178f9fd37950955128015ce22ae7e57db2a05ea5721bcb570206be3d50875d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites, likely to facilitate the download of further malicious content. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=karnan+tamil+movie+download PDF link annotation
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f59ca25f0e---tamapijaxigij.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/32347700364.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210912155643.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/88891072323.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/156756771613633d7e61d6.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce1b48ae90---jivokabaxun.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/92670340474.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/gifojexazewobezojinix.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16134e3727fc8e---33742160145.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/sazudisemuzupevetefa.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/fipuzemipekufitokokonej.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/wolomubesewu.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109030403156669.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/misivipofuwojax.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/15050577212.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/76560736693.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/zijomexow.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/gizelidukimokugipewibo.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210917_220416.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427d17e0cb1---43473753977.pdfIn PDF document text
    • http://stefani.cz/fck/file/8655669868.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/65895784447.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/16267425135.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/gadajinabotunufetejinabiz.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/fibipajetogofida.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_off0000e36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36C 17692 bytes
SHA-256: ba5b03c5a35436999a34ccbdf96319dfbde86da8f9367a1a837b67010ea785ed
font_01_sfnt_off000110b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B5 10384 bytes
SHA-256: 98a0dbc480b6882b1f3c11b23a6a03ce246704a2933c71eb4fb34810260f22fa
font_02_sfnt_off00012831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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