Malicious PDF — malware analysis report

Static analysis result for SHA-256 96f073507f06a5d0…

MALICIOUS

PDF

105.0 KB Created: 2021-08-17 16:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b1ce84f3a82dc4bc57f90d9a40e5853 SHA-1: 058ce143ab5a3cb9222c32c0c8819dd3ecfb093d SHA-256: 96f073507f06a5d0b7c342f7b24c00663c31862beebcc08f73bcae28db063b3f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9532

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://airholic.com/UpFiles/WebEditorFiles/file/7190160579.pdf
    • http://hurtowniagrafit.pl/userfiles/file/wanemagudux.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ld6p49t44d896805bbcq83hgs0/bemasugugexovuzesi.pdf
    • https://gruppopolidori.com/upload/image/file/40230639884.pdf
    • http://smclassof57.org/clients/34860/File/66533596040.pdf
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/kopopesarus.pdf
    • https://pcetravel.com/files/file/jugoxaxovikedixisajaguw.pdf
    • http://innovad-ltd.com/userfiles/file/voxuxegalup.pdf
    • https://zegabilisim.com/calisma2/files/uploads/xexurulob.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/72svcdtjf2n8munbi8rj7g0m1s/63574530610.pdf
    • http://stardentalcare.org/userfiles/file/wefudi.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/0il3ta35pf95h15f663k84fmlb/1599924164.pdf
    • http://v-lukomorie.com/uploader/files/zusomiluwipipugedilo.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607811d0889fd---59762993740.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0846268c7---76692276126.pdf
    • http://nebo52.ru/uploads/files/miximilosag.pdf
    • http://dlmberatung.ch/userfiles/files/6486816233.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/1ee380e1399e6290b63c87fc8eb51b0b/mitaxokamosokeze.pdf
    • http://extracam.es/app/webroot/arxius/file/xuwelap.pdf
    • http://tiga.co.th/ckfinder/userfiles/files/xutuz.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ea4fd9217b47851670952fd275771e90/muwunotozikowaba.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/n3pl5kov5mcsnq5gpo860i48me/16678895567.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/e7413dcf8164fe93f2ffaf570429b529/84546828827.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ajn34rvrubiq5fb3vv1r94v6s7/najixebegixiganesix.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16075ac26094ac---72789369974.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abcabae5082---kolesinexiwelumufa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=descargar+adobe+audition+1.5+gratis+full+crack
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010eab.bin
a286f7cb3e67bffb3d714b22f118ed9fe50a2d069ecfb68c5426f5dde5727b81
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAB 29796 bytes
font_01_sfnt_off000149ef.bin
2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489
pdf-font-stream PDF embedded font (sfnt) at offset 0x149EF 16204 bytes
font_02_sfnt_off00015fa1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA1 16792 bytes
font_03_sfnt_off000177b8.bin
736c7466fffafcff85a03cf5ca310bb92ff4bb5f036ce149649aab6335ec7e90
pdf-font-stream PDF embedded font (sfnt) at offset 0x177B8 11236 bytes