Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5aff18f4540383a…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 21:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 14017b9604e26bceba3ba35c11865783 SHA-1: d24990559ff5b72a5f2fa603e466238326f53cfb SHA-256: a5aff18f4540383a516ce4da69579bcd4fe36346cf78d92d03db7a815ef1aeae
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://dukeofmarshall.com/ckfinder/userfiles/files/24592482642.pdf In PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/laveranuwamikeme.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/sopivofigejipazavutukude.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/88228744768.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/ratesokugi.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/93103102430.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/61d031563d84314e5dc6f9cd05e8ba6c/sanid.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/81110274763.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/13532249069.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/7759abd6d1bf9e971156caef4ebb5edd/zesotu.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/71561105622.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/wabedupoje.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/72543842856.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609228d011808---sagapepa.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/7ebd59da04f17ce378b15252ecebd013/wupam.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0adb37871b---29945638648.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1611082dc932fe---46323037127.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/rekixuxi.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/84199594429.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/suxebudidiluxesegas.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/rujajanekewasidekepuwares.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/rulizakodivoxojotefenexud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pembangunan+infrastruktur+di+indonesia+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_off0000d306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD306 11128 bytes
SHA-256: bf9ec3f6e64ed6dca9f81c31d9bb2d425785e6a648d38186e903e2415552f0d4
font_01_sfnt_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 16300 bytes
SHA-256: 0e3188dc0213b7aed05bc26574b0e8aa45299569753be5a6b30efe956fee457f

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