Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d2de8c8acbb6da2…

MALICIOUS

PDF

87.0 KB Created: 2021-09-02 20:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b537cd0f099f72992f65b99845f7aea SHA-1: d3f7842987d311f4b2feea295bddde34ce9e8d00 SHA-256: 2d2de8c8acbb6da2c3767fe5bcbf0d37dfccb74535b4d1481afdbe9b5aa82947
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or other potentially malicious hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure as a link farm suggests an attempt to obscure the ultimate destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://eyescare.vn/app/webroot/upload/ckfinder/files/9777732795.pdf
    • http://ultraljud.nu/bild/files/gesazepapolijipe.pdf
    • https://beldaoyun.com/calisma2/files/uploads/11672296553.pdf
    • http://aspbae.org/userfiles/file/gusitobinunosu.pdf
    • http://ttfi.org/app/webroot/userfiles/file/nofadexokijolo.pdf
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/86053797522.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1f9af434---wejavafurarug.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ffc2329c3---59385393472.pdf
    • http://whatdwellswithin.com/file/57447219216.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607328c534c4a---30483250889.pdf
    • https://mimpishio1bet.com/contents/files/mumojape.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/k19uvs6c1v4i34quhef2t45l1h/58579681775.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2324616df---43659106658.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/1eb3cb4401143494cacafbf58126d1c8/noromiregufalib.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bb3e1d315---26671210412.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf51b81691d---mukaxojufutapumabuxova.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/9lq5hf3s8ggp9dgt3aigrdi7g4/79477178406.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2c64afd3a5e238ca0d70ebdfec28d626/75558558346.pdf
    • http://edu-tur.ru/userfiles/file/67874495190.pdf
    • http://heydarbaba.org/resimler/files/memaxasi.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acac4e2e663---gewilumaludawifeso.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/1dbe76f993c58035cb77ba365cad6902/bajubimabopujoka.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160793a4260085---gubosajafefapowikev.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160884ae82925f---26730064540.pdf
    • http://jualumnitoronto.com/editor/uploadfiles/11679680401.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/fisaji.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=rrb+ntpc+cen+01%2F2019+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_off0000e1d9.bin
c7e9b39352d4f85a1cff156086b88e9c96df82190bbe79507868e61bdb8b26a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D9 10704 bytes
font_01_sfnt_off0000fa76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 16792 bytes
font_02_sfnt_off00011288.bin
2da0c0c8185b8740aa2a12e7b72e096c76a2583130638d2c350941e115a2e660
pdf-font-stream PDF embedded font (sfnt) at offset 0x11288 24048 bytes