Malicious PDF — malware analysis report

Static analysis result for SHA-256 82aeb5a9f0db931a…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 06:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 74a33e524e101ab38bf1096d1c4d14b6 SHA-1: 69e6d1451db316d61ce64cf7e01d5c4fb5ef1ec7 SHA-256: 82aeb5a9f0db931a0f9f7f0ef984a04b52598e3d35f980776646b066cc21d3df
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://birnagarcollege.in/userfiles/file/xovixutotibojerepu.pdf In PDF document text
    • https://kisikana.hr/userfiles/file/94570652740.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/nugeriv.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/xanovobajejigewofedi.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/ziwofakuwinabubaburizogux.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/situwujufagebatidefa.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa36d7edc15---16132663885.pdfIn PDF document text
    • http://hotechike.com/files/files/10715957390.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54683608334.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/zuwigutawusigobiwuduxoxi.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210630071015_7u7nzi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf49a59fee---tabatebi.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/tefupefekuvuru.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/071827a27c50555d3d21c963b7c676d0/rabesifofukatijoluruvi.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/28601935939.pdfIn PDF document text
    • http://ezibra.pl/upload//file/51210233862.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/917af24f458de6c100c0ec7dd3aa76f1/75484761349.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/35932456117.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/6d748191088d66db6d83581b8328f98e/56227819666.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/s7iehgf296ptnjok1qt9nf3mb6/8104376648.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/rometuba.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/57rkh4r0q31g02am03ph10fnld/vaxog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=chandigarh+administration+clerk+previous+papers+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_off0000db5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF374 11356 bytes
SHA-256: cfdeee2d6b9bdf7632273faa6d2e5597710f9358a49c1ce8b1d481a98bf72d5d
font_02_sfnt_off00010dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD0 19708 bytes
SHA-256: 6e08335ce20ad013614d0eb862db60b6d2479d8b146928e6190cfe7080ffb006

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