Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c69dd2f29295c00…

MALICIOUS

PDF

88.1 KB Created: 2021-07-01 22:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 557b1d46a8dffacef20e08b000658afc SHA-1: b6f557ff9b42fc15c052c6c037a91ea91f6f233c SHA-256: 2c69dd2f29295c0020d7a4bc363116e1db0c8bee80aac67d711560cc781f68fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites and disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=classifying+polynomials+by+degree+and+number+of+terms+worksheet PDF link annotation
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b98dbe2e83a---raxebusojudividomuxodet.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/nedefujulunikegij.pdfIn PDF document text
    • https://istanajp2.com/contents//files/ganifububegorupalimu.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75624b2051---25654248712.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072602885a15---lamubugejinagenile.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/vapuxalukefasafuzer.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/v1v4o3jav8pf9gf4stkcj1plr7/21303303333.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095d9f817683---zaxejefuked.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc86f1e923---wusupifasez.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/49987424816.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021062420381733.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/jovopogirarubi.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864bffc7802---74777407944.pdfIn PDF document text
    • https://2acontractor.it/images/file/situzije.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/11335615623.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/2979381593.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16096fa1460ca5---63385554407.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74a8ee7c9e---8412655061.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/424eeab2fbbdf731371de18c6c0a390c/15993854981.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/dibubipusuxodanukemuv.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807b2746d92---foremotatirinubijemaxig.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/luduxuzajexusonakojof.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/bosufebakato.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/xaminita.pdfIn PDF document text
    • 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_off0000ee21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 17968 bytes
SHA-256: 1609c6a2ab8384ca70fa1f6bfb955a32bb2deec121088fba79f60e0e5b6e7c52
font_01_sfnt_off00011ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDB 11508 bytes
SHA-256: a4bccdf5971e85b86dd4ffd12a3d17013d2da36800219f978a6dd42dc23169f0
font_02_sfnt_off0001388b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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