Malicious PDF — malware analysis report

Static analysis result for SHA-256 d746036fe33ee88a…

MALICIOUS

PDF

72.8 KB Created: 2021-09-07 13:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 728e71faa0e4ab51a56f75fe6fe8853d SHA-1: d2e702c04dcf7890a79f48976655ba21fd79efe4 SHA-256: d746036fe33ee88a1a0a01e20b7912bd0745a00c7ea2308b3f8f5add76591bae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the structure and numerous external links suggest an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ahcxdq.com/uploads/file/021434139720.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/082a4695584fc15d4a53cb8b31aabbb0/vinakanedumabi.pdf
    • http://sevenseahotel.com/uploads/images/files/20199451977.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b42aa4a0851---vozoxefozoforoxifodate.pdf
    • http://htwy.com/upload/file/73124448800.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/be1658dbd5ba1e75a3ea10a83b7aff76/15184735154.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/bifalovowij.pdf
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/21a08e54d554ba2ace7c004fd5262167/8893816333.pdf
    • https://www.htlexpress.com/ckfinder/userfiles/files/rokutelinimatijaze.pdf
    • https://palcev.ru/userfiles/file/fesinexepenazewutozovenon.pdf
    • https://essaidafm.com/uploads/FCK_files/file/29222825890.pdf
    • http://leaguengn.com/userfiles/file///momimuki.pdf
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/49838874466.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/6f0ffeeb0e96fd97f38c971f57439de0/66895669910.pdf
    • http://b-solutions.net/userfiles/file/20363308863.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161083ef8409ae---wemipotidawik.pdf
    • http://rollfactorytogo.com/uploads/files/49996637500.pdf
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/tiperivofasi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=constituent+assembly+debates+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b997.bin
4555492d448c666df4a367f313b52c15cf4417f2f009f87eef5623961a980f3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB997 11028 bytes
font_01_sfnt_off0000d320.bin
5d1245595bf56efd96662b2d42b18d9cafc92feb199d6d5a679842667f1c6db6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD320 16616 bytes
font_02_sfnt_off0000fd9e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9E 16792 bytes

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