Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6ded0fd5de42ab…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 16:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1543ddd1d6a66bfcef6d3a1a5e5de1d4 SHA-1: a2e8449c34fe727953b5f234467fa179124bdccc SHA-256: aa6ded0fd5de42ab959420e6206ef0b27aeb05bbb96afea96fa9cc2ed3d698f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/bueheg4mn5gk49dnaiv7b9q7bm/jelifatimogedidavosemijuk.pdf In PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/882d1bb497960725635a56205be8e9ab/55735461086.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/podasojuvikafup.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/118768e94ddb73c98a1d21641bd79bb3/ratuwuvasapazaliponedas.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a24094b95a---favakuzusozedemaxorix.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607299a49d989---niwaduxubideri.pdfIn PDF document text
    • http://elm3rad.comfile/49595377380.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/08/13/file/74292998325.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/1411182563.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/563082678b7d1436ef1ba71b1ff47ae8/84779826909.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/xosonivedebigoragufiz.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/4f290bde565fc361d6834cc6242b1e32/32081947117.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8fba2db84---84925687812.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/59332811502.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/jibajigewowutobixexave.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/86f1e12537eaa0116eb23edd06b14248/viwaditigivavot.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/38615488615.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/wukojifinilogasikadawif.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/wamakamekalafo.pdfIn PDF document text
    • http://thecrayfamily.com/clients/36408/File/zufuwoji.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/nevalofasofodebapububa.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2df747c6b3---73232538962.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/2c8f7e20db8019bc36fccb10d91c2abf/wesonusozukoxina.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/gopuxujese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=anexo+v+simples+nacional+2019+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_off0000d64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64C 18872 bytes
SHA-256: 48cbea098693e85879ec216efdf5b00957d65ae166f2c313cc937adf8bb154e4
font_01_sfnt_off00010760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 11192 bytes
SHA-256: bbeba952c9c63f00487ba7b45c0e3b6e41cc257d8853810068bb85a87816f8f7
font_02_sfnt_off000121b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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