Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d13804a34f8d262…

MALICIOUS

PDF

96.3 KB Created: 2021-07-22 12:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c46c8a10c74140d6f9720b4fe80fa9f3 SHA-1: b6be3e09f7bc64fb9252612a530251341f55e38f SHA-256: 3d13804a34f8d262279f6fcf3303a88e9966db0695b7a8061500bd6f70caa9b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed for phishing or malware distribution. The embedded JavaScript stream, while not directly analyzed for malicious intent in this report, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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 http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2f6e2768d---neluvudelizuxejob.pdf In PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609173c986032---74371180871.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/kegib.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bb2fe2173---modonivuresatagofuk.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/75877630541.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/sidokudoxajikasalom.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ff2ec03ba---9625503416.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/kolutikirem.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/64563039181.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/vofuxoda.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608501ed3d831---59605552553.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f477f70e89---manopegojonexutajelulabiv.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/70685661320.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed5dd3e4eb0---69186921329.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803e706cbc4---xerudujegokufebulot.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608e921965c13---35770931199.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f375a1c895a---997602089.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/cb9bb4b87db8e4635609da35f647b221/51105986148.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/56270824227.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/26525257951.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/zorewakonerexobizadepi.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/4af38b496d9ec1428c7e86d572d8c615/wasoxivi.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/16138831857.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/sejinopa.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/76045258309.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/48akjeeo0t19ulft2npkf33ne7/nesinopag.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/92827949728.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/roraxuvowaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=praise+the+lord+in+this+housePDF 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_off00011420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11420 10444 bytes
SHA-256: b37490529f7ed05d9781bae57ca71c2609b57252c908a4aebbee57bd9b67dbdc
font_01_sfnt_off00012bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB9 17636 bytes
SHA-256: 089002095d191c587f7955e747f2c498566a9fbd654eb098b9e4ac1cb4567d74
font_02_sfnt_off00015984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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