Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c96bd9edffa861f…

MALICIOUS

PDF

90.7 KB Created: 2021-09-08 13:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3bcde44ccade2f2af265c98a52ea0695 SHA-1: ce8d0b58f6c02fd7e20ffb81621c8f77e9d44da9 SHA-256: 4c96bd9edffa861fc3376949de77fde77bd3b8d38e427859849dc2ebe07d9a2d
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous URLs, some pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a lure for phishing or malware distribution. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://wastran.ru/uplcv?utm_term=passive+voice+present+simple+and+present+continuous+exercises+pdf PDF link annotation
    • http://isotech.si/uporabnik/file/20084329796.pdfIn PDF document text
    • http://zerosquareonline.com/file/jukosozunakijaxiwixusive.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/kuwajujigekemexe.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/mutilogonuraxulobovufezog.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/32467929486.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/27840303622.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/tirigimun.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/3c0f867df0f60c7bbfb5d3842f9dcd3b/vetawob.pdfIn PDF document text
    • http://speckrepej.com/upload/file/vojurerumudapefuvos.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021911518185323.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/jobanapadusorudiwomegewa.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/xopudolaz.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/tuvabawuto.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/10061830320.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/sujejonumilugewojakotu.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/23c6f4798e7550ee83d13cf4768ffc63/xamusegosaxojulegobemiw.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344e0e79dec---64265118951.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/86305581820.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/zutufokevumubowu.pdfIn PDF document text
    • http://gzmingjun.com/uploadfile/files/20210908_070454.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/sipitopizanamabezu.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/22406456219.pdfIn PDF document text
    • http://fxlcd.com/upload/file/45060173491.pdfIn PDF document text
    • https://tcremich.lu/files/files/wejibetebuxaf.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e3904b824---1420395280.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/kanokanuminabuwifos.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_off0000f4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F3 11052 bytes
SHA-256: f1013a9a24769c43556572b12e48b24bf403daba238b4f20a6a4b112920665ff
font_01_sfnt_off00010ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D0 20620 bytes
SHA-256: 56b5611e51cb86591c30387a945e9ed781d6c575167a5458f7cafe4679b68797

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