Malicious PDF — malware analysis report

Static analysis result for SHA-256 719a6808f2b46e71…

MALICIOUS

PDF

92.0 KB Created: 2021-07-24 12:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 937f6f64476b05edbb62a422d3b7bce4 SHA-1: f9121e4cede9a898661a239cf862943dffb637a6 SHA-256: 719a6808f2b46e71766d18d64d25ca0986a8d6f940ed7ac14b14eaa4cca34246
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to lure users to malicious sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073ac6c098ce---23587828741.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d23d0b4d1---nogaxuvetunonuvidowozid.pdf
    • http://magogaralbamoble.com/galeria/files/48220754354.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e736cbcb800---57195459977.pdf
    • http://northcity.rs/slike/files/ritabawigosu.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a8dbe4e39---vixekabewodeb.pdf
    • https://hse.tw/upload/file/18860992744.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d253ba07cf---12960935858.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/8b69b119575872abd243f25427ebd2fd/bejut.pdf
    • http://ural-resyrs.ru/data/file/59561073815.pdf
    • http://zuche0551.com/upload/file/67585447122.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fa4fdaa72---pujirezajidigikanepan.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/b8d0618704c635df47a80f10a478f423/nuxepimop.pdf
    • http://refta-bg.com/userfiles/file/gigexepeforadokuwivaku.pdf
    • http://tweddlefoto.com/files_contenidos/upload/files/tixogeweropujikafolanom.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f1ba3888c---39400699811.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06df3a8475---54039256569.pdf
    • https://vieclamxaydung24h.com/upload/files/78246400633.pdf
    • https://otartufo.com/ckfinder/tartufofiles/files/1666567604.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5206c9ca---44239081649.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee4d9ed829---7896961497.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4031799276---50610455934.pdf
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/63349605540.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1299acfb84---fujevugemofepig.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ca26237de---33751438827.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eedffd6440---7163475546.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=carpenter+invar+36+datasheet
    • 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_off000102bc.bin
bde9a488d00c7cb9411228a2d4ee7132198a5e3b99a04ae41a348bbfeafa2d16
pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 17444 bytes
font_01_sfnt_off000130ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130BA 16792 bytes
font_02_sfnt_off000148d1.bin
099153b93ea01293e5668d76cd21064c93a3204714414a21a29697c38892c168
pdf-font-stream PDF embedded font (sfnt) at offset 0x148D1 10760 bytes