Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a3a478cbd32acd…

MALICIOUS

PDF

86.2 KB Created: 2021-06-26 10:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c57905ffa91060efdc64baf599357db SHA-1: 4b689f493807a89e30f3b228f7c3342560646449 SHA-256: 57a3a478cbd32acd268ba30ded661f4f6ffa9a43d10c090c60892d5e361d2932
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, aiming to direct users to download further malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a phishing or malware distribution attempt. No scripts were extracted, limiting the analysis of specific execution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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 http://ebsenglish.net/_UploadFile/Images/file/80704675335.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/4c8c097674f1cb046c501b81f2365846/65336275869.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606f69da13274---zorod.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/db0f830267a26c858e3fd229ad2bf8b2/fisidojavig.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d9ead82ab---roxajokeged.pdf
    • http://koovappadyscb.com/ckfinder/userfiles/files/zoginusogixof.pdf
    • http://volkshilfe-vlbg.at/images/content/files/30453190636.pdf
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/xidiririvo.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/905df799c3d371a6582004f0c5e6ecb2/xewewukeboxabagu.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23532acdbd---79109925047.pdf
    • https://steammining.com/userfiles/file/71350210905.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0efa7f1bd---39887672061.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/idk9gm020j26r6m6n5ggi26r02/wuguno.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608931d1df129---76443236998.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/64c12cffe1ee3bd2c3b81b93d8bca0cd/18216381954.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/8ce108ead25fe8f94a9f1d811282265c/42895439552.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7b1257813---gilijitoduti.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b1ede7a00---lonam.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3178f6bda2---96692527585.pdf
    • https://minipowerpack.net/upload/files/71452518507.pdf
    • http://sportingclubalbinia.eu/userfiles/files/46594949762.pdf
    • http://studiogiovannone.com/userfiles/files/87142035222.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/h49kormg4qq5jhbin5m3h37h31/55871100525.pdf
    • http://showplus.ae/userfiles/files/32101619781.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cellular+and+molecular+immunology+abbas+free+download+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_off0000ed6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED6C 16792 bytes
font_01_sfnt_off0001057e.bin
bf912b49323e561f2f4063a6e64c50d9a09a942990ecee058af5232ee1981739
pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 16628 bytes
font_02_sfnt_off000130b3.bin
a5ed0a4aa790baf674ad5707e049769f61738b5bf2e896a37909f0006fd38aeb
pdf-font-stream PDF embedded font (sfnt) at offset 0x130B3 11336 bytes