Malicious PDF — malware analysis report

Static analysis result for SHA-256 90634ead097441fc…

MALICIOUS

PDF

87.4 KB Created: 2021-09-01 05:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 768472ba41f4606b37bf58cdc54ca25d SHA-1: 6ea8344af98936c4528c74a38c8d70ab703ddfaf SHA-256: 90634ead097441fc5c10e6c2b7ca761cffc5a3dd3413c1a02560ad1ef7bd89c9
154 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6221

Heuristics 5

  • 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
  • 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://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/c5dc33d622eb5659e1ce764fb3d5aa2d/limef.pdf In PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/74630602303.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/1787729361.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/zatutuxasuferininodu.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/e44911b8d81fa56a25943c3812f8b0da/vajuzafozekawod.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/xizamumaf.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16077e841a8974---gewamekajanabagivepaw.pdfIn PDF document text
    • http://thegioinoithatcamranh.com/media/ftp/file/2283862060.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/gopun.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/39943123110.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/n92kosmpplujsg79ve1q844g6d/59219818168.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/33163988654.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/04f2f2f002649bfd6f51c419dc64f1bd/xefifitiropadedujidozul.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/83555246692.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160826d1768a0e---75382726493.pdfIn PDF document text
    • http://bronia.org/userfiles/file/34343089810.pdfIn PDF document text
    • http://quaint-house.com/nineve.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/jetaradiratugu.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/kuzetugovufegut.pdfIn PDF document text
    • http://princeton1959.com/clients/863834/File/lugitalomem.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/tefamakovubopezew.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0731/2bfea07368956cfb612c14b435719e0b.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=10+acres+in+sq+ftPDF link annotation
    • 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_off00010527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10527 10388 bytes
SHA-256: 04f5c4d06c89ae878a0fb5ca70223a372e57886c908a5d2c73fe9ad11f801860
font_01_sfnt_off00011cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E5 18348 bytes
SHA-256: 4640373daadd32d93a77d8fa36b612a79b2274df596f5d159e633111aa67c8d5

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