Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac3a5e1e408e3de…

MALICIOUS

PDF

76.1 KB Created: 2021-09-07 23:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e51a4d219e30839bb11cec490a842c86 SHA-1: c4c24be816df72d61cfc8545b67daa878c10c814 SHA-256: 3ac3a5e1e408e3de0b469bd2c4fac0410cace361e9b184183c9f996803acb443
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pistant.ru/uplcv?utm_term=verb+worksheet+for+year+2 PDF link annotation
    • https://brothers-music.com/ckfinder/userfiles/files/kowogumitijukilikizo.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/36284059418.pdfIn PDF document text
    • http://12shio5.com/contents/files/48005719076.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/e88f9bfccd346a534f8fc4ecccf708f7/silari.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/04219cf51098ca77595fa6f80039e5c5/54406539714.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/89951784623.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/93990362201.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/5059ddf3237d56c91a609223fc7b7cbd/jaroxetuso.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f73d5a234---dorilubufupanejaze.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/0039499cacf11ff1111efb0b7d4c7a77/jafinumev.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/6111889040.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/aa7251d224a7a264138311ff50bbd486/kaxibafikogej.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3d4ca0d74---sixinudovebamaxepowiwopu.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/40299438640.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161080146a6104---volurivorigugudexif.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/6de82cdcb3126b3c22cf4ca8988f9f36/gagibizinitisujitewev.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/57197774d1bce14949f8c3a00740de47/dowudoweruxideguwubedab.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a054da16030---63416271202.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/74140061663.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/156829af593319d756538e2a0c014a09/pasupurano.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/giroxunorumomaxawoma.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/tofogevedinowuxetuju.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/41352881653.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0fd6c16a7---suritiravu.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_off0000c57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57D 17300 bytes
SHA-256: 07f6df515adb032d02cf259154eb8eb5b1b282a9416bb22a4d1fd81d2dce75d6
font_01_sfnt_off0000f230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 10592 bytes
SHA-256: a36f6fa10c3e8147060a7082b28c4aaf2d19171d52bf45b941c4444aec747ac2
font_02_sfnt_off00010abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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