Malicious PDF — malware analysis report

Static analysis result for SHA-256 c466b9755e014080…

MALICIOUS

PDF

84.8 KB Created: 2021-07-06 06:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 04064bd6eb56ffcd37096a4dcf5a9a5e SHA-1: db624a0f45040ab79451c154a6f4c13c0815e856 SHA-256: c466b9755e0140804c51b856afe362726fee62aea2d42573f27bf809a4ec5a77
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, several of which are hosted on compromised CMS platforms. This suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=6+feet+1.5+inches+in+cm PDF link annotation
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/e16a31b67ee9c5c4a0fff230eef481f4/67436156578.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/29d3t3fu33gg5akfe28knksj3n/26315825223.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/67157606340.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/20bcedef2fa0008d816b806978cc1065/nirapi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16096594a8df8a---13173506002.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210609162745.pdfIn PDF document text
    • http://muszempilla.com/files/file/juxorupujemola.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd814c9e404---tejaxubivim.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/rebufobafijuzugatopolowax.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/461e5d5d689688880d55513b925fd6c8/fedokotagudovidudej.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/rofuwojixekexejaga.pdfIn PDF document text
    • http://polipack.ru/content/file/wusawon.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/1067cd69d75222b6accc5071151b6b13/7310207165.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b59a18946---15543747751.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d44d702f2---fewadavokozazu.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/rirapajitimit.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f78f01a5e80b509f23abb4279b99ae20/rexin.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/69388173164.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2de74851c3---gowozaxusomulinezagofiji.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/katusazevuxa.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e0d031f86---wubokatepebikidejavamo.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/jg20n18hvefiodnokmc0l73ppd/jakesizonugeromebomubovor.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/lb4tcdo18u74lcerv0ftchn5o1/dafiwikesad.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/mixepokifu.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/684j28i2jbknt1hbt47gv7ldn5/terapuvadoxof.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_off0000e91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91C 10496 bytes
SHA-256: 089be5b95e3142dee725d2070a84eb41010dcc7c24ff9e69f3fd174f4eb0ed55
font_01_sfnt_off000100d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E7 17396 bytes
SHA-256: b59dc16d04c0cee7eabe104cea18ee4752f847d67ddc6b0e3d5ecfc9a1620611