Malicious PDF — malware analysis report

Static analysis result for SHA-256 5975933d375af1d5…

MALICIOUS

PDF

90.2 KB Created: 2021-08-01 21:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db8f65e9bcd1dd9909011194e0443f66 SHA-1: a3fbf384ba6728c501f0d2d7533360787d9b7e8e SHA-256: 5975933d375af1d54b423c4c6be48224799eef08a22e8602a826eb8c863e53f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609174c109900---51250736179.pdf In PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8513000e4a---50673489259.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/13470666578.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/832fad491f397478201545f68a856a87/81209139500.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/wefufinarejo.pdfIn PDF document text
    • http://ogbchurch.com/clients/880797/File/11387305227.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b0a084bdf---fixonuruvogod.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3fa9004ad---viwogef.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a98d4c91538---zafabigavazewudo.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/8249ec54754969d62002b83a91a65297/sogikivuxirorukoduzem.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/71766525624.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/57769857380.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/adb982f2fd859ecba3d0aa8d0bfef7e3/fikuxigusuxapoze.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/14202597809.pdfIn PDF document text
    • http://yejida.com/userfiles/file/81163140079.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/9m9sc9nq7vejc1c114dfaq7dal/342862719.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/dawizodi.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/oalrhjtvnt2umtb16o8llkj4ju/wigatexigo.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/domukiwironibapire.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/legosebazurefi.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/33195084979.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a80d9463bea---72764939144.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/d5a741e21bd68059da7fbb6755140094/losutemanipulozipi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c2124bc3f9287cf21e84b92861e41b5f/3512364768.pdfIn PDF document text
    • http://megalaserasia.com/upload///94550174792.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/riron.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/sovexalerukirewewejuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+considered+tangible+personal+property+in+californiaPDF 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_off0000face.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACE 17308 bytes
SHA-256: 07c4bf6b907e311731fc128d4bd3ef2ca200e898156cb533d799a88ce4501c07
font_01_sfnt_off00012847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12847 11148 bytes
SHA-256: bd8d4605bccfd8ce41b65668ce34c7db910a5b8ddad0b70168e567c76bb1de4b
font_02_sfnt_off000141de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1