Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52351cbe23976b4…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 07:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f07178d534d20d642217d91702d16639 SHA-1: 8c6f6408b10b3b9c04f71ab638559073d9519295 SHA-256: e52351cbe23976b440ca3abe9f43b7192649b90b67081ba2c0235d9b432c23f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple domains, including compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the ultimate destination and evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://drafthe.ru/uplcv?utm_term=tree+transplanter+manual PDF link annotation
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/mutanufupamilenos.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/7210340816.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/31850025474.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/tebexodenewij.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210510030307015.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/14809925204.pdfIn PDF document text
    • https://podimercrm.com/img/files/kabamagigevemoned.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27eaa5d0cd---66274120598.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a47957928---34305728579.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/2237a2a3d3ca47d7a738bafbbc42d30e/pijusipejavu.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43fc07e12a---87848803716.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9bb13e8e08---27179934313.pdfIn PDF document text
    • https://cargotavio.ru/files/file/nerifalotujumebutovepajav.pdfIn PDF document text
    • https://123natura.com/stockages/files/65620870139.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/68873522003.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4daa3d94b---49927212558.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/77655608182.pdfIn PDF document text
    • https://atesolve.com/ckfinder/userfiles/files/dajipejisu.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210611003019_t1x8i3.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210614100945.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/75813550488.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/f7jgtvm1pjgehue6t9868e9svi/zalirofunipes.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/52529139299.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/56162548167.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1610ffbf953825---wetixilawowolu.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/81b8341ae8581497a884b5af930d12f0/somudogi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB0 16844 bytes
SHA-256: 0647939e6696550c5930dedc3984aaf47a41a55cf5e6172afe89a9fcf748c38a
font_01_sfnt_off00010728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10728 10264 bytes
SHA-256: 7d3d81be74026fa5830e078a7f7120e8c1e2b2705259938b7ef10f73db6ee26b
font_02_sfnt_off00011e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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