Malicious PDF — malware analysis report

Static analysis result for SHA-256 18579a5d9a84b368…

MALICIOUS

PDF

87.8 KB Created: 2021-06-29 12:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b8bb51e1f5afffcac0b7eb333c2ed5a5 SHA-1: ad225f769f47683e9b7fd11e721a70d82c94ed10 SHA-256: 18579a5d9a84b36800b83850e7d2cdfbd4f50c2012e2982231cb569819a47894
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised Content Management Systems (CMS), indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary attack pattern being the use of a malicious document as an attachment in spearphishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/k4c56d95roo9r06cl4i6daku7l/wikalirupuz.pdf In PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb3e8b31a3---vepolikikig.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/59084003326.pdfIn PDF document text
    • http://cnp-inc.com/ckupload/files/gujiwovosatuvud.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/94378656308.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20cb3daf9---fipifofepabifoburuzu.pdfIn PDF document text
    • https://shidoremicrosys.com/media/jenetariduxoj.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e17d8d866f---16843923292.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845caaf0ee2---pajowujenek.pdfIn PDF document text
    • http://balone.net/_upload/file///99623594556.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/bb6fa13775fc99c0b98590fea1d8ddb9/mafolupivomobilimugitilom.pdfIn PDF document text
    • https://tipresentoio.it/images/file/kojelugijawenemuri.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/24644620511.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16096e61d527a4---58195946899.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a95db877fa1---fewufojokusoxipitu.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/51528f6515c7b56c5180a13ba14adfc1/sefosolanavasinewedowip.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160928884657fe---sakelog.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3efe91af3---79109107437.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/dcd4aa51c0b2248be3799098f814ce32/lujovujireri.pdfIn PDF document text
    • https://gangnampools.com/contents//files/24723526270.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/d2305653852c0c74024fe96d713ecf9f/vavabedisenak.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607576874bf8e---39763532918.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160849dbbcec4f---xiwudinemufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sweet+and+sour+veggie+stir+fryPDF 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_off0000f122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 10924 bytes
SHA-256: c2a5d455b6158c433d385f96daa9d3dbfea53c2a52e1ca39b2ee82e804025405
font_01_sfnt_off00010a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A72 17944 bytes
SHA-256: 5112d0d993d8fe1d457ccf8d3947739f513f4a3f4fc7d9d498611f0880aa04ee
font_02_sfnt_off000139d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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