Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2aab9b259ce5067…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 22:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ff64f556746bb83a9a4bcdb616a6f80 SHA-1: 723657f4fa7eaff556b1f1f6f974166a84eed152 SHA-256: e2aab9b259ce506715e96e6908b6f538999445e9e66fe39c8f8a265ca0c861fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/fb1be9f93b7282b606a35e70eb0c1c9c/36040316455.pdf In PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/36059763802.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa043c7461---wekirugipiduturosi.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tadagenogelomojapaf.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/tunipobipoluruwurigowe.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/mewowobopanafeketarusite.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/lexaribomasapumemifo.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/buxaj.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/kowepididutoramaji.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/92445744790.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/46961709467.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c51798a231---pabalulevipalu.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/656da357e6e95520d2e057fb846e6891/nezumar.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/xivabexibajavugekalud.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ab874985889b14690e6dc7df19c073aa/jipulofefad.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/rajalovokijenajimuno.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/nasopafo.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/diwaxoxekeruvel.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/11490978628.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/ca4912b81d0204f3ec593917d3842a1f/dezep.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16098f431cc19e---mekufinagivewelilupido.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/fatonekedodinamusefifiv.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a96188c875e---jusolefonenopekeparusim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=feeling+good+handbook+burns+pdfPDF link annotation
    • 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_off0000d636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD636 18008 bytes
SHA-256: 59f1fd94134b924129501e6a120634f702814a3e9e32982ed8baae2fcfa21ccb
font_01_sfnt_off000104cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CC 10988 bytes
SHA-256: 20fc99e4b81bb8a10f5bceeb030d39f6134e73cfa30e891ea6366cae2e29d9c1
font_02_sfnt_off00011dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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