Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc4e8824a25525e…

MALICIOUS

PDF

117.4 KB Created: 2021-07-02 15:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e40b7b1375ae10d96a82d37f6f9c206b SHA-1: c7ad621257ca98f848a26548729e74e96c4b12b1 SHA-256: 8bc4e8824a25525e2dd69e22ae741bdbcbd8fce1838167c8146658cb6e804adf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9883

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://synerhu.ru/uplcv?utm_term=quantum+field+theory+lewis+ryder PDF link annotation
    • http://bogelaipigeon.com/upload/file/zimivonaxikigetemukaputox.pdfIn PDF document text
    • http://www.puhito.hu/uploads/kakitefajitisawezawaz.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021626125738180.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072981277203---33106321815.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/504183ba31560c4ca5445af597ba1ab3/gugebabadodasulexaponamun.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/suwewofexag.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725693931ba---kilababujesutunir.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/55i5u94qt7nv9b16ptres7tlc4/20274431758.pdfIn PDF document text
    • https://mfdesign.hu/files/file/nanudotatubugebo.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/81632062858.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/kefajuxafadale.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/16570896655.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/60650742777.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/66bf6e7932e37f29cd645750df2aa028/kaduzatoriju.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/rifalujiz.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/28532188768.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac94560561f---5831512893.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/wifab.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/tufufef.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f7e22a3fbe4ffd6ea0d6a944b2c9206a/27816547811.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160984afeb2c57---56643024846.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/53785415603.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/moregolunapi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD220 59092 bytes
SHA-256: ab37bcce1503ae88354decd4ce9f4d3a6974a578ef2340cb8c4904ae3636fc5b
font_01_sfnt_off000168e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168E2 17424 bytes
SHA-256: b3f464efbd9cbcca7c04526f90c9dd8d90b68600e8770d580c82318c912ecf65
font_02_sfnt_off0001963e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1963E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001ae55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE55 10976 bytes
SHA-256: 7dfbc7544eb7e8d4d6fa3d39642e306c7cce6f2ded86cd54f7441d6a24756f71

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