Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3053984a79a7b72…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 22:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 74ae7378e5d91a2abe9b8a5b4870a57c SHA-1: 7750dcba6cc446a8647827721fda306a3725a9ab SHA-256: c3053984a79a7b721c6c108ba95477ce0c64a2d82a2fa5ce3b73b0f0b96464da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=bluestacks+hd+app+player+pro PDF link annotation
    • http://budapesticukraszdak.hu/userfiles/files/lopilezatojike.pdfIn PDF document text
    • http://bamila.vn/luutru/files/11237682321.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/b1971cbafaa1fdad356ba348bb224ca3/62410210015.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/batotivunalafilubik.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ce24db1992feb854825b997de892c777/wegaboviti.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3bb1cc36a---5051311211.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/998872647.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/pabuvudo.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210902084557_n1usw3.pdfIn PDF document text
    • https://akvaguru.hu/user/file/51141455791.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/ripavalunazirekupelukunox.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/90583038787.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135b657d74a2---74255715958.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/37853810851.pdfIn PDF document text
    • http://goldmustang.ru/files/files/73498722687.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/tezapumewuliduv.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/vopikisevadenarosipimo.pdfIn PDF document text
    • http://getvisa.ru/images/File/93218069646.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/funederelitanisole.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/74948260178.pdfIn PDF document text
    • https://kaimano.it/file/44236331313.pdfIn PDF document text
    • https://begili.com/uploads/image/files/48164072853.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/ximijefexen.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/ladodetado.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/43167592594.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_off0000deae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAE 18468 bytes
SHA-256: 1ae320f4b554f58413856973e74535ef7cd5b41b5cf6456ce596df6bf9890097
font_01_sfnt_off00010e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001265b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265B 10772 bytes
SHA-256: ce8d031f7c9afc06d54f0b231eb3c6c9847e908facb95180fd81653c3dbf406f

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