Malicious PDF — malware analysis report

Static analysis result for SHA-256 5423f311e7aedeb1…

MALICIOUS

PDF

85.7 KB Created: 2021-09-01 11:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d88735f231a0e934c415bcbc6838bbf SHA-1: 384ffd616517c378624dbd1fb521240ad0c52ce2 SHA-256: 5423f311e7aedeb1c4167c3166d6e4b270ea1d38c39460f9775a6197c4992d63
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous links to external sites, many of which host PDF files. Heuristics indicate this is an advance-fee scam, likely using the JavaScript to facilitate the redirection or download of further malicious content. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • 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://refour.eu/wp-content/plugins/super-forms/uploads/php/files/20c00134549f23b9acba846a04f6ab9d/58528224561.pdf
    • https://basalyemek.com/ckfinder/userfiles/files/mikabanizodaxuponu.pdf
    • http://konstruktor33.ru/app/webroot/files/files/dawugowuvel.pdf
    • http://learnazia.com/fck/imagesfile/79316986707.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ee52cd926d9d8d094701425f606f871f/xokuduretorakokimubatizu.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/mevuwosabulodaturebule.pdf
    • https://congchung7.com/upload/file/66312315404.pdf
    • http://cudicio.it/images/file/63730965672.pdf
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/piwob.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/wopasuvurazabofe.pdf
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/tukisebeligujutiwoboxum.pdf
    • http://ats-dz.com/userfiles/file/wovogabeg.pdf
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/81946431151.pdf
    • http://www.kotolantopeni.cz/files/29432870097.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac09353d254---suxiseriso.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/bfd967f395e883a3e7d268b8da10579e/linetedekenujasaparem.pdf
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/67538396990.pdf
    • https://matteagianotti.ch/userfiles/files/miremutirujebutedojelelu.pdf
    • http://niezapominajkowo.eu/userfiles/file/luriku.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/0a74179c3b1ab1bdc7b030c333ef53cc/vukimuloja.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d3981c3cb---29267551818.pdf
    • https://zifu-tech.com/app/webroot/userfiles/files/fokurekurepamidozofele.pdf
    • http://praconsulgroup.ru/pict/file/30817367214.pdf
    • http://drukarnia-warszawa.pl/pliki/file/soxazapega.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/48433274a6ef4c114bfa89d6fcee2898/dodinawijurubusukosuva.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+book+of+gold+leaves+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_off0000e142.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 16792 bytes
font_01_sfnt_off0000f954.bin
0b6e7612ddf3a70a1da6ce0c76cee110a3925eb0f94f5fdb49d77ffacee619db
pdf-font-stream PDF embedded font (sfnt) at offset 0xF954 21508 bytes
font_02_sfnt_off00012ffe.bin
d9d75e913d7aa8de6dec327dcb628050c455b4c8e732aac85e297cff9e0217e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFE 10644 bytes