Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b37cb176044f26f…

MALICIOUS

PDF

72.9 KB Created: 2021-09-17 21:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 51151d69fb350aa7363007be7fb4f3c6 SHA-1: 20fe858ee844fc039b5997c95451c36f9896ffb4 SHA-256: 3b37cb176044f26f0c3b7728b1283fdd1f8e45b7a0320bdff6e9680f461f500d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm used for malware distribution or phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly indicate malicious intent. Although no scripts were extracted, the structure and URLs point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614015c630189---madeju.pdf In PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72070218016.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/57371433320.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/zukugasebalosab.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/xikirurawoboxagowalupudul.pdfIn PDF document text
    • http://parateam.cz/file/tafelopasogamolufuvobi.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/pigerikufatidir.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/kasoselaj.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/52477013327.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/56de557f00412e19b29c38a85efbb862/wivoto.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161410e6990d92---46261859163.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/15268750235.pdfIn PDF document text
    • http://gekon.net/userfiles/file/21120241827.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9ff7cbd8dd3f92f20888ecab8726fd9f/xufaxibe.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/rominaxilerew.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/41813896799.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141d1a629c9d---najaxezubeg.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/gaxoxi.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/60545069583.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/watuliwanimepefejoma.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/77950283207.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109120625372341.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/1133013668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=descargar+minecraft+pocket+edition+gratis+para+pcPDF 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_off0000ba6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6D 11012 bytes
SHA-256: 9af4b95d413a545c679de28baf9325c313304481fa2b1ae8adfbc29a0f11d745
font_01_sfnt_off0000d3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF1 15652 bytes
SHA-256: 480c44a2dcf63849075fc0c25b2401d09242e75f12b0633e9b3e4a9283bbe8bc

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