Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e62c88c62fd001e…

MALICIOUS

PDF

85.0 KB Created: 2021-09-13 16:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6ed8490f657a0bee2ad43e4f22a4920 SHA-1: 6ea361361d849e2b134f61e3d6cfbef40d20831c SHA-256: 2e62c88c62fd001ec779c20c6a6e18e85c5b272fda63faedac8209907d62bd32
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of JavaScript points to its use in executing malicious actions or facilitating redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://restauraceeverest.cz/userfiles/file/7887390920.pdf In PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5d22d9880---84763523831.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/9465504679.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/lipuroposikedifijagev.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/46092122728.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/divepepomafusir.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/62468112679.pdfIn PDF document text
    • http://tid.vn/upload/files/52261212039.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/popedemabuxaru.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/21680932241.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/81868659398.pdfIn PDF document text
    • https://rafautama.com/uploads/file/wikuxiziwirike.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/fuxojoximadajapekiv.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/45511738150.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138dc68a7534.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/tolomevubadonavujogugi.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/62208865996.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/61425910562.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/49998849699.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139306f20e40---29111455240.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/58757733642.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/97302491471.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/50958158013.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/zejomevoxufu.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/tobutirezawamiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=best+real+flight+simulator+for+androidPDF 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_off0000e6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F2 17568 bytes
SHA-256: 39e2c8a931564f2d6ef6964229c3bcaa111180a52b99aae642c5bbdbc88c9f3f
font_01_sfnt_off00011527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11527 10956 bytes
SHA-256: 7d30d5e1776938206e4b7af0804b7fca7f00bae295d7ae2e3fadfc04d0de8ab3
font_02_sfnt_off00012e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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