Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d582838d36af5ad…

MALICIOUS

PDF

102.2 KB Created: 2021-07-25 13:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86ee142519c037f25ece22a8684f004c SHA-1: f682ce5365e727a7beea22bac6ac2b0004c95aef SHA-256: 4d582838d36af5adfa44ec20928daef528226cabeba6f42e62cd6572663de33e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and multiple links pointing to compromised WordPress sites and other disposable hosting, suggesting it is used to distribute further malicious content or conduct phishing attacks. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160fa715c7fbfd---98272623828.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86295ed52b---wubukenivokasanuza.pdf
    • https://uetty.xyz/js/ckfinder/userfiles/files/93956947410.pdf
    • http://winterwonderlandzundert.nl/uploadimages/files/bonusozamile.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074028276b00---binurenoketugujisaxakov.pdf
    • https://thai-airpark.com/ckfinder/userfiles/files/zurisodegat.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2156a5035---62718190272.pdf
    • http://geoodwierty.pl/files/file/76023783003.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4db66a8a7---11081657396.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/13b80409bec2fa1e9278577739f07de5/nekipusivi.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a370552c127---lekenemori.pdf
    • http://ji-tien.com/userfiles/file/77938409605.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/1fe4874deca84042e9a539b689ec652a/buvexupesakowajidofabu.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/l7t9a3ertn4ncd81op5ti7n6a1/wuxawatevalixofobotuxozaw.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/vapbsg9dquaa7uiac5msedf895/38644634698.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ec7867f52cdca9b0dea862da365bb22d/79431526489.pdf
    • http://matraholding.hu/images/userfiles/files/28951381172.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f46ac0119---77930749443.pdf
    • http://cerezolorente.com/files/cerezolorente/_repo/file/99201508175.pdf
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/jolaw.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160828b9ab8b1e---kabakapitawokiz.pdf
    • https://gadd-asso.org/userfiles/file/9916763189.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/e825ed2950337d3e60d603f65c674e05/93122159252.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/fc14b3a456479e6620cee2c572866e9f/tuborapawisi.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9e77db105---98450848152.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=forza+horizon+4+rally+tuning+guide
    • 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_off00012ee5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE5 16792 bytes
font_01_sfnt_off000146fc.bin
23f252e5a2059c78d03ca9d714cff867102123b48b84012e5f6d4036f6947868
pdf-font-stream PDF embedded font (sfnt) at offset 0x146FC 10688 bytes
font_02_sfnt_off00015f44.bin
156ac7a66cf7468e9cf441963985906f940429d880125fb476f08f4e514c7b28
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F44 16924 bytes