Malicious PDF — malware analysis report

Static analysis result for SHA-256 3261d8c149f20358…

MALICIOUS

PDF

83.4 KB Created: 2021-07-08 02:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bb36344bbdaa57c443c5b1e04444def2 SHA-1: 7db7fdaa157761b93fe2a4783fefd5087b3c6ef2 SHA-256: 3261d8c149f20358445d25fe02fbbf9e14a6c9a4dc0d3473bfc2f69e75f53fd6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/8c04736d3f58b8a3c52952162235e97a/mupikimuza.pdf In PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a18bb4db52e---37477132087.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b26ff96f5b---xafag.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/dajedizejepekaz.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/ankmjij4rtkmsil6h357vutknt/naxud.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/tifisisigogufa.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/64775431821.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/58461669051.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/58573603335.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/bbjv71rg9nr5j6spu56tui8tp0/rabipukatiserofijoviw.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/33316540534.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///lojajujaxizope.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c5acb5412---tosup.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/94306954966.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/mekefejizo.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b41c2d0213---17320647714.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210624020559.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/jodetebopunuxogidibi.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e6ba130420ca929888f5def1705892ba/bujinevisikurowizisebu.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/97824222694.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/a5a651d340829e2c952b6cea4184b231/xuwemezajiwux.pdfIn PDF document text
    • https://sambelteri.com/contents//files/siderujowitij.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/rdcp5hmil5kedvu8u0js30ve07/ferifak.pdfIn PDF document text
    • http://whewfamily.com/clients/12004/File/zifofemumetex.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/27706542275.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/f81a8c701d02a69301a6c518aca8a5a6/79556305290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=100+ideas+that+changed+architecture+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_off0000e02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02D 10912 bytes
SHA-256: affd66132668142ace4fe6c55610544bc518c6d443f75b6be303b9e4a91fe45e
font_01_sfnt_off0000f92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92E 18072 bytes
SHA-256: 794a8e0abaeed7399b17e241a23ecdceef4a7cb7b5599ff5e4bbb24626ec8b22
font_02_sfnt_off0001283e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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