Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c73513d3cc9fbaa…

MALICIOUS

PDF

101.5 KB Created: 2021-06-29 14:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 693ebf836322782e3d13bef1d5bcc8e1 SHA-1: 8f834ad0abc4272ddd60b51cb2af571ceda4fea0 SHA-256: 4c73513d3cc9fbaa91704003bed71abc21c9344cc01c8bf80f3078bd94d3714d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

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://allytemp.ru/uplcv?utm_term=square+root+of+127
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c84fc20974c---vemisunaxeba.pdf
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/wuvowikiwifebewajisovi.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b426649bb01---64758354811.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4321b66ad1e18ad46dda21f37b16affe/padidivogobuzibetefutedu.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737fbbdf0ce---49009763661.pdf
    • https://pasarantogel2.com/contents//files/paweponelixax.pdf
    • https://scavilecis.it/userfiles/file/91566873529.pdf
    • http://firegallery.ru/img/upload/19737962054.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/0ac3df2fb7871a16e6d10ebf9b20ff2b/22938103555.pdf
    • http://commune-bourre.com/userfiles/file/wuwavoxokufinadulapejeki.pdf
    • http://barudan.hk/UploadFile/file/20210625222934552.pdf
    • http://www.tomasjelinek.com/img/pub/file/sanujigufefivagagefimotu.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c54911c77b0---bunubam.pdf
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79981753716.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d962fe4816---mukobubuzonelumijidov.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dad233dc53f---90041162932.pdf
    • http://muzeumostrowiec.pl/obrazy/file/22302449448.pdf
    • http://ankamet.com/userfiles/file/noxubuvidavexovemijuworop.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/96442773982.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/ced8589ee2d4e61f221c80722f300068/81924815400.pdf
    • http://irina-beha.com/ckfinder/userfiles/files/femenidorovilaza.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/73865388639.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a26e02e13---weresuduperagetawij.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/9aef105phlsv2f4ua7r36593t7/farinizunufisonosuwapusuv.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/cd92d8970a1a26df300bd54a1ea41a54/sibonedonigezus.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/remtjabka8nlna34jf8lvespr0/fiponerozigexitivameboxab.pdf
    • http://inglewood1968.com/clients/68690/File/71149544549.pdf
    • 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_off00012870.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12870 16792 bytes
font_01_sfnt_off00014082.bin
ef384afbcaff6582a38e7dfe83812edd8943efa3a81e1f33148b2928030d5944		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14082 18292 bytes
font_02_sfnt_off00016f6a.bin
3b0b208bddd341de793a620bf77b0af854fe48745fb8c65224b38e958d3387a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F6A 10340 bytes

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