Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e5a2ace9ceb2d2…

MALICIOUS

PDF

80.3 KB Created: 2021-09-01 20:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c9fc2d9db6720006c220825ff800d3bc SHA-1: 37dcf761bcbb9fa433190e78893527058905e843 SHA-256: 71e5a2ace9ceb2d2bd348694d587bed7db67a7e8a854120c539840d69c750db4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress sites and other domains hosting PDF files. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 https://gilbertems.com/videos/file/koratixuxowojetikapabas.pdf In PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6d29475cc---82077273166.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/kibuzalaxunefife.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/45935335847.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/xidewazolipireb.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/ligusanapudilifusapin.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/12121aef797355cce691d76d55a05294/marezoziteje.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51e2a23c67---purelawolupesajalibuvur.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c760e8bd42---sixikaxaburererasu.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/7945571991.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/defodajexovunadevezojud.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca476cb14db---tujevixupatofafok.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/rifam.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3cea244f0c0c52138e24286eb925b60d/zibati.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/womigajog.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/70281504831.pdfIn PDF document text
    • https://grancom.by/upload/docs/15661897524.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/dojojixosaxagiretoxor.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/gidudidorujafutewa.pdfIn PDF document text
    • http://abroadster.com/files/somawis.pdfIn PDF document text
    • https://lapiadinafelice.it/file/jejufasiwozeverejanadotap.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/67feb731bb1288c9c833b2f4d4ba0071/80267795018.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/14212ee6cc56e353e20d556faeac0e11/99050536590.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/52922614741.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8d06c5098dd084e9f8075427cf997001/luzomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=aesthetica+of+a+rogue+hero+television+showPDF link annotation
    • https://b2cdemo.tickets.com/content/files/xikafetiwujonibuxatifux.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40E 17964 bytes
SHA-256: ded41283a69fa8d28e2fc09f7454222dc5407ad30be458bf9f165f0bfbe80f7d
font_01_sfnt_off000101ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C4 10848 bytes
SHA-256: 02be97219ab3f0083962feea0c091363eb5d9df852639551af455b42e80a4bc9

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