Malicious PDF — malware analysis report

Static analysis result for SHA-256 9222822587ab2c36…

MALICIOUS

PDF

80.8 KB Created: 2021-09-03 14:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 86ff4b66faf2c8c44ee263e62f407925 SHA-1: 53da3de4cf6ea2f05815a21e0625eab02e07769b SHA-256: 9222822587ab2c36551fa45b01076c8b0a78d0e0d8414eb6c230d25a2ff22703
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

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://almondzwealth.com/administrator/imagetemp/file/ridiwokuzexasujaxabopexe.pdf In PDF document text
    • http://csc-0898.com/userfiles/file/20210816140947_57gv4w.pdfIn PDF document text
    • http://etre-belle.su/images/file/sokejirenuwujopodagadip.pdfIn PDF document text
    • https://mytopics.it/uploads/file/88876816144.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/digirovevuku.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/29176570964.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/b6fcf722f7276caa6336b8558880c521/87600523325.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abda9cc0750---36746071764.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/57005303812.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b418215cd---difopasogopovomowososudol.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/87587736787.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608100cf9dd79---dabetakisajunutovawop.pdfIn PDF document text
    • http://ttc-investco.com/img/files/26617687841.pdfIn PDF document text
    • https://tavio.ru/files/file/ximidunoz.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/31220827563.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/7b8f0253db44c90f36dc532e83e01d10/45229464126.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160997edecd3e4---85914793609.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/e6f8e1e104bb8c3b64a29329aaff0c4e/kamuvimofu.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/vodisunatuzawesasepilo.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/50354656942.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210628120431547897558.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/bumezukevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=school+holiday+calendar+2020+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_off0000d60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60D 10884 bytes
SHA-256: 2be06708b9307e8493713d965a9ca38ae0f59e7b90bdb75ff0dfee6daacaccee
font_01_sfnt_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 18072 bytes
SHA-256: 62bbab84d55c469135aede8fd4385b550926c5bfcfc18dad235825d8c01c7494
font_02_sfnt_off00011dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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