Malicious PDF — malware analysis report

Static analysis result for SHA-256 2763c2326ee6b9dc…

MALICIOUS

PDF

80.0 KB Created: 2021-08-14 11:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 037fa46f8d985770cd39031b8caf64d0 SHA-1: 25113108076cc48be4ecf3713bd2bc40606a8dc1 SHA-256: 2763c2326ee6b9dc3db38461ec8f90fb06f6f020c5a8ca7bd78381bfc6ee99c6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it contains a link farm pointing to compromised WordPress uploads and potentially disposable hosting, suggesting a lure to a malicious site. The 'MFA lure' heuristic further supports a credential harvesting or session token theft attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://balaji-technology.com/userfiles/file/mubaxinukanajumabuvi.pdf In PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/giriwagidupexoko.pdfIn PDF document text
    • https://purefeeling8.com/data/file/ririvowir.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986d1f2789a---48016637834.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/jisewibazetalipuwufuk.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621194665.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/87832084966.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8123e374c8b337343c4e857f8e8287b9/4797634894.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/19aa4705ca69049945e75a7ad223c56c/bimaxasumidakolewetixa.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/ac2e98d09ebea81c60c93c8aa72663a3/duwetixotojewowapozalot.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/25128820292.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/73287547523.pdfIn PDF document text
    • https://argumentua.com/i/file/46547205842.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/54723437312.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/gujexunutikavudewenim.pdfIn PDF document text
    • http://agama-rc.com/upload/files/toximojolunota.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/61222690602.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/wibamaza.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/xewufegixukopodamo.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f26aec1f609---92613610544.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/96879394366.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/25347575685.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/nowal.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/sixukudowenovasoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=netgear+wifi+extender+wn3000rpv2+manualPDF 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_off0000d248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD248 16988 bytes
SHA-256: 57195658a2ba33c2d3751670300b13606f4f098bcdadca296f488aea0d83865d
font_01_sfnt_off0000fe8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A2 11300 bytes
SHA-256: e915b0a0eb40fd87f1bcc6b971e042370a14e3dc29cb71f40f7724546e5eb1a2

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