Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2f1630a49bc187…

MALICIOUS

PDF

68.4 KB Created: 2021-09-21 09:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 42874c3ee2011a18d55c44296052e596 SHA-1: 3d6693d505f12a209af9623942e311d32f20771a SHA-256: 9a2f1630a49bc187bf1a813ed07b5da3c0225f1a16211fe274c5628b4f21a4c7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, employing an image-based design with a clickable action to redirect users to external sites. The presence of embedded JavaScript and a high number of external links, many pointing to compromised CMS uploads or disposable hosting, strongly suggests malicious intent. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://studiotecnicomaglio.it/userfiles/files/tatosekusogenujijerumanop.pdf In PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/1805854714613f41df1866f.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161495dfc4ce63---jebizadira.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/xivokigunavipunirifixer.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/003237f41ee9485f6d2cb3a88d893b24/muvapot.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/du2sb834evpckumivf18bgp4is/buginopojefuwoxe.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/difufesikuseweronagewe.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/4827638023.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/tasizometamonew.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/31662863170.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/dafimizelabu.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb7cad72de---20097130861.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/88cae6a7dd7afe8696a7c886c412655a/76941706917.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/29241218053.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/figevopexilewexonilile.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c48b7ff55---92957774246.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/turagutuxutemegarimase.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/lidanefebezikita.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/fegekebisilisama.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/50502888630.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/sadididanaratopixul.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/19805110774.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/73275949821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+make+purple+in+acrylic+paintPDF 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_off0000b087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB087 14112 bytes
SHA-256: 2c3056e4a8412edb204a00c744b4b95498a3748b764542831cd62e14247f3e97
font_01_sfnt_off0000d33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB55 10752 bytes
SHA-256: 89f3d9db37548af4f87da5e87cc6098a928500adab9f7652add51422845a7fe0

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