Malicious PDF — malware analysis report

Static analysis result for SHA-256 b028f5adda52a3fc…

MALICIOUS

PDF

88.6 KB Created: 2021-06-29 02:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58b8f73b2eb8d149fc3e9c0e0d7ec9f6 SHA-1: 0cc65205a4008635e4b5013380d65ce9db8a6b69 SHA-256: b028f5adda52a3fcae5af8a6f2740b873e13c22b782ec7ef3125f84454ab2d6c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs hosted on compromised WordPress sites, as indicated by the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa125f3b339---85885379430.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9e4d6293b---lesuxaletabukesomo.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/rv9a4t0krbmv1sd5ehq0nh1ehm/dusoveze.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f10d0913d---nobil.pdf
    • https://a2designbg.com/userfiles/file/nijofa.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/0070c5eab614178aee69af07d94bca33/vowaxedenudigavuliwed.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/add3b3fc0e8eeddc01dc87f7b5dd9ae1/28350006432.pdf
    • https://srinivasagroup.com/ci/userfiles/files/48244506925.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/bbcbb7c033bca24ed3872ad8fded7e0e/zubupisaf.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a6b7601e5---pewekuxize.pdf
    • http://washchienluoc.com/upload/file/xamavor.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0afe54242---fapujumirevedebani.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b71a967e6---kisigasurusefolizoduvu.pdf
    • http://jshtextile.com/UserFiles/file///94352188673.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/a16cffc361bd33e0232a4ad8c6bc0aca/jakifirulumel.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f31f57b6aaee00231fd6f1afd21ca272/pazife.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/8j8ok0dfdckpmnfhq9to07cut0/fixagupudogejolejuniked.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c90c0a519---93069351168.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2bd3705c708d9b7302d880906b9a097a/zurexokuxejed.pdf
    • http://naturallabs.fr/userfiles/file/bilalexisopixozube.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b21d4d2651a---buruviwitex.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/r3dcv5mr7qaekldicf1aa580v8/menevuxowavo.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160771c99c84e6---batowiroxexusi.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/5881c10cb423eb349af7b29061f6dae8/18281143603.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+is+neutralization+give+two+examples
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8992bc560a---61874685568.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_off0000f228.bin
3667f76dbf6166deac74a0a354605c19c5a1d50977f1744bda7e6d46f4f56ce3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF228 18336 bytes
font_01_sfnt_off000122bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122BF 16792 bytes
font_02_sfnt_off00013ad6.bin
85c09c63a9dd8764c347ec1d4a6f2825a121d9ce793cf2cf796e954a72f5a330
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD6 11104 bytes