Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d2840a64c8d25ae…

MALICIOUS

PDF

79.6 KB Created: 2021-09-24 07:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a43a58befdd1a52908477cb0f4f3b47 SHA-1: 20afac2d83c9f132f2b49eece953515d8190b507 SHA-256: 2d2840a64c8d25aee3019a0da04613351a0ae5b24d423668789542b7d2d14106
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to phishing sites or malware downloads. No specific family could be identified, but the techniques used are consistent with a malicious document dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://mobil-tech.com/files/gabatiwifobawazelo.pdf
    • https://zenithoverseas.com/assets/userfiles/files/96485548472.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c97f66aa134100f037725f3062e95487/zuxagu.pdf
    • http://scro.ru/pic/file/10341092762.pdf
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/47968515927.pdf
    • http://tivatijapan.com/uploads/userfiles/file/90913389851.pdf
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/favovojewuwo.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c02d9444d4---nuzerafobixasok.pdf
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/59762671120.pdf
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/68784180697.pdf
    • http://jualumnitoronto.com/editor/uploadfiles/rufadoratisemo.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab3e73da6f---pawedubite.pdf
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/66392409057.pdf
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/sakenoratixos.pdf
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/gijudevufaxupesukefa.pdf
    • http://2sisaccount.com/userfiles/files/jejizoxozimi.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149afd98c2cb---pasixisonabopokivodotarig.pdf
    • http://daotaonhaccong.com/uploads/userfiles/file/nijejelififem.pdf
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/44045853110.pdf
    • https://medicentrumnz.eu/medicentrum/files/file/jinozezutok.pdf
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/99186553475.pdf
    • https://oolong-dining-co.com/webroot/editor-uploads/files/5323785052.pdf
    • http://www.centrosanmarco.eu/img/news/files/17909745926.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8450eeee3365429956f62aacc609b641/gewonudopezubug.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cut+and+paste+photos+apk
    • 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_off0000d311.bin
6d47c4647913b0507843fa2dd0852214e69c0ca70dc3a0af48fb603a38a56a6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD311 17440 bytes
font_01_sfnt_off000100a1.bin
b65fdcb33aedd38d67a82861110041118571ec1cf356bb2be37bac2fa2090f08
pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 10476 bytes
font_02_sfnt_off00011867.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11867 16792 bytes