Malicious PDF — malware analysis report

Static analysis result for SHA-256 439c95a091c6d86a…

MALICIOUS

PDF

118.1 KB Created: 2021-07-03 05:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0c9a6a9661ae6c6d28e443f65bfd2159 SHA-1: 689d8dcbb3e47cd3191f8cea0d99b397287c6f8d SHA-256: 439c95a091c6d86ac578ac9588340ef83ea002161c3f0a7277d1734c53c4822b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload storage, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings confirm the presence of a link farm designed to lead users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9676

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://apsons.eu/files/file/maxoruronosulasakipax.pdf In PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/juderibogupifupanowu.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/70416659037.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcfb77e980---8449230863.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/745f3efdc2d24a50f0a6fbdfc73649f7/99235162769.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/bbeee6ae929095a7e264d7bfb6ecf014/64097614676.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/f299a7818a4a7c84ea99f446c58318de/vajuwulalejiwi.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/36c3048d71f031a35605375a3cc7ed03/89209773059.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/nosofuvipitodutarunewel.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d352841e050---bugij.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2cd8bcf04f---mekomurepika.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c3bb3b346---63761673565.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c601467c4c8---92613057128.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feeba9d7c9---vojagugonuvijekazositife.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/zoxipenixivodulox.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/faa1c44f8c51016c6cbd919e6e7b7207/69834175369.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/runovubikipuxafefepula.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c398870e72e---20635490317.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/rijuzoxaxo.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1d9ea2d5e---bopezototivipureloroz.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccd0f9ff15---lunixonedu.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/29db58e040562f9657c2c9aa84d800d6/fetarusikixekow.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac57e729d3f---12124380111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=explore+meaning+in+englishPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00010ddb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10DDB 25960 bytes
SHA-256: 54a9585651692da003f5b03ab28301fe9b5d932e2d70b084937f223ce341b452
font_01_sfnt_off00013e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15638 6084 bytes
SHA-256: f7a76d799fbd483f1e75a6680f2a55d61ff7ab8296f09379130ef220355fba7b
font_03_sfnt_off00016b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B1C 10688 bytes
SHA-256: 4e0f6458c6aead472d8452e63bd5c67842507d134a466e63d5c4bacd608ff2fd
font_04_sfnt_off0001835b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1835B 29976 bytes
SHA-256: c17ca3d26d0a34b374d2f3fcde76085a29c7a79ebcd64473bc3c960349d71c91

Open this report in the interactive analyzer, or submit your own file for analysis.