Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6724bb8b657a4cf…

MALICIOUS

PDF

79.3 KB Created: 2021-09-03 23:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 70551c55d765db0ae12e59487bc088ae SHA-1: bc60ad580e3a597683f4ae7033255a9dc757e191 SHA-256: e6724bb8b657a4cfeaa33665cb38d41300aecbe627aa6f76ab7410b774d6e790
176 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised WordPress sites or disposable hosting. The embedded URLs and the PDF's structure suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://asiarsolutions.com/userfiles/file/36708653269.pdf In PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/2714d364eb0cb82094483bf9091c1ed3/kojurakolexik.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/qg6c6k9693v88qut2s87cfl4jt/47009367597.pdfIn PDF document text
    • https://dietmoitangoc68.com/upload/files/7116596779.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210521055421_1302031853.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/f853d958470557d01b2b4148ad3a4e13/fokufeneneditixijera.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/e5b8f03733ba367d9f06a03696edeb39/duvidogem.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/s38pje6p6o5gjtcbcgloqblvap/6624466501.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16088287724fce---wemisabimenafu.pdfPDF link annotation
    • https://www.mds-horizons.com/upload/files/78649415785.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb4c2c17fa---69877371277.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/98362043842.pdfIn PDF document text
    • https://drlanda.hu/user/file/fexitegozufuzaxadim.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1771e47c23---49678432176.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/icnp319i5vtfo8fkpjkura1q4c/64469689947.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/19499191448.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b50f1694dec---44290822176.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/tarevoz.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1610b38537473d---revovamofozawonaz.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/esdd2nkg0rvb3ak4l4igg0gu84/34104644703.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/d1b469a9b0e7e3a9a7a99a46408255fb/80583060834.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/b4c4f6fda77c204ea264118bc90313fa/44473536114.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/dugedeborafawa.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/42007a7c81a70cf8333b51db7eaf1e17/kuwojubadux.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/72553417452.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f54639796---romurefejagaxenatasozafaz.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/zitazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=slime+tensei+novel+pdfPDF 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_off0000c718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC718 20948 bytes
SHA-256: 8e20910279147c3ca62654f1220c7be1b34c49d873e9bcadbee25f00ec919fd4
font_01_sfnt_off0000fe36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001164d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164D 10536 bytes
SHA-256: 6db3b2a89c0b97456fcd313075a445ec2d1046ded214f5fb5ca3d25688a91433

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