Malicious PDF — malware analysis report

Static analysis result for SHA-256 289ccac9f0df9381…

MALICIOUS

PDF

103.6 KB Created: 2021-06-13 06:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a23a33d19cb81416476ca4009da7da31 SHA-1: f5284b2ee7cf56cc55932d9814246852218ee7c8 SHA-256: 289ccac9f0df9381ef4817317959f491f13e3d4c27af18c1958b745fccce0259
164 Risk Score

Malware Insights

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

This PDF document exhibits malicious characteristics, including multiple links to compromised WordPress sites and a URL containing a 'free download' term, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document likely aims to trick users into downloading a secondary payload by presenting a deceptive download prompt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=bookworm+oxford+free+download PDF link annotation
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609003412b511---dixarodorigelosogulosen.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/4baa414106cd16a75d61f28fdbb67fe4/55982859895.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/md5npn8hcoa5vkio0vk4du1qo0/47579279661.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160826eea2eae5---xuvanakarokar.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60b422d24498d.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf065082cb---xodapokuxir.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/srp5h6h58ceikhb9hh8ve0ek34/wasinemefabex.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808c29a01c6---xoxusoxefuxatevamazefes.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/59459484961.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/424966034609f4d4817b61.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5d5881743---repaxolamega.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a577c60a1---katiligudupatigukegisum.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/b9ec7hkgdqiv4hnoldecgiv91e/96674674795.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/noninepizokejezekowepenuf.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/344ebe0ab91fe3158e2def6a6955b920/gumipadibebesivemuwoludap.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/dacd73c385cc0edf7a29f4c852da16d7/jerafoxozot.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076fe1fa55e8---golugikixubinet.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/34c1b860a1454a0aa836154c92604f79/jizimejikosixomimunaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBC 8300 bytes
SHA-256: be48250ea2c0611806f5b8bb828bc1e41f9b3ec6c7a8c4b17e40065218566318
font_01_sfnt_off00014b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B74 5148 bytes
SHA-256: ce91cb0aaaea0531a7e6dd38c9a91b91d80097adcd034b417b7e685f77f67737
font_02_sfnt_off00015cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CFD 15960 bytes
SHA-256: 3f8118bbf1e084e440bcc67d7e8e9d85bb99ab2ce669d2c15896433f5f6a875d

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