Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57c9ddeecd4e443…

MALICIOUS

PDF

87.9 KB Created: 2021-07-06 00:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3088b693022df8559c40abc62a02e79f SHA-1: 649cc512287f6a236d8ec103064476f80a45b4a4 SHA-256: e57c9ddeecd4e4432c7c12cbc627487c9649e0513d28ec11d1c1e0e3ed154240
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/4e7bdbdc0d15d7165465a0aeecd4a299/16362480736.pdf In PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/cd50fa81f9e48f8be5b1e9c82682b398/45145192725.pdfIn PDF document text
    • https://activepymes.com/pub/file/nadenod.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/nakumalujoso.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/88579951311.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/47838377761.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/g5lkclvltvmt75c7ck7bm9e154/50084550685.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/juganedoguxu.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/zipuzojok.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/83793815538.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608222010ac90---20534331982.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/xaxumigijuvoxoz.pdfIn PDF document text
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/zuwotadamo.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160791a2e9f012---vavomuxeg.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/jtv3o12gde290i0fqf800c38v3/davazazedevuwunaropaloxa.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609f05bea59c8---41912951222.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f84bacbe21---88696342161.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6992d29c6ead9ddb606d3261447f66cb/16691999849.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086c1d89fef4---57261940588.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/34611805477.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e487b572f---xuweranuzofutefupusa.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16247889222058.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/zabujov.pdfIn PDF document text
    • https://amblamy.ee/upload/file/88765618592.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/molozizugekugigolewilidup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=examples+of+modern+control+systemsPDF 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_off0000f526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 16780 bytes
SHA-256: 1f458271e7286506024344de6b1bffd47f7543b3b3ce1aee87a16359063b3398
font_01_sfnt_off000120d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D0 10888 bytes
SHA-256: e1cf333fcc0b05e3008128a778d2b92a6fc53ab473ff6b86da789644f189e11f
font_02_sfnt_off00013a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1