Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead7d6a864890534…

MALICIOUS

PDF

74.3 KB Created: 2021-07-01 23:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 247edeee48efeeff1f02e02de41722e2 SHA-1: dc7f63c43fc09412af6f37fe69267f2029bf9d98 SHA-256: ead7d6a864890534c467c0149a064217fcdaad4b56c8440e693abcd84ded7bce
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised WordPress installations, suggesting it's designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://inwebjor.ru/uplcv?utm_term=nose+and+throat
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/b5e927283fd427a987de19d247a6519f/nanebus.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c2454b42e---94608747141.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/5qg4nl1agom52a4kd8opdup95h/fefovejibatozevezavane.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/7bf072e67f1bc59565f3dfc70708963c/xijewadawapamigoxiz.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/madonesofiduzen.pdf
    • https://sasalidayanisma.org/uploads/file/tikorixuvepunudob.pdf
    • http://www.herbertvanderbrugghen.nl/draft/ruzubasunagiwobogi.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/fexaradinusokujofi.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607317cbafbde---rokuw.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/6hg2rafhprl5vpu6i3sotbssnm/8828978570.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/44848199795.pdf
    • http://aelma.com/sites/default/userfiles/file/beniv.pdf
    • http://geredekombiservisi.com/userfiles/file/32746366984.pdf
    • http://mobiliteit.nu/files/33463873712.pdf
    • https://ludifrance.fr/userfiles/file/58996038076.pdf
    • http://poslovniimenik.net/firme_data/files/74286293666.pdf
    • http://notarbrazda.cz/userfiles/file/likivewibadefelowamizuzo.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/75d7bbace201c53e450b7952e34efee4/93889579527.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d96a6a8bfa5---jefoxuginuke.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ad2cb77df---teweradizip.pdf
    • http://gillsandgeckos.com/userfiles/file/38133988794.pdf
    • https://dbmotorbrokers.com/userfiles/file/96106565437.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16077813a3d8ee---femaz.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/fta5o0gf3f114c96epdc15875d/44179608816.pdf
    • 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_off0000c489.bin
e1ed1b374dd43acf4b12abf4135c56ee7785a29649cfc68186b5dc07ad601520
pdf-font-stream PDF embedded font (sfnt) at offset 0xC489 15900 bytes
font_01_sfnt_off0000ed8b.bin
cb91b8bc64551534f6d298d4dbbbeb272f6a063baae9977308417b29b70aa376
pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 10184 bytes
font_02_sfnt_off00010450.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 16792 bytes