Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa630103efe68435…

MALICIOUS

PDF

88.6 KB Created: 2021-09-02 22:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4ee0ef10808748e83b4a4f64489f1edb SHA-1: a0370501ba63ec0e5a8375a38ebbbbd3a4e627ec SHA-256: fa630103efe6843574a851cc3b3f74221affa9c422a62efde4580eaa0612a7db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://red-adlay.com/upload/files/kepeteluf.pdf In PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/jemulakozasagujapobozoke.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/d917aa76e2ad3477f7328c8d5044cd06/togosalepazilu.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/81a51808d8981153eb9e9d594d17daad/45604299579.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6e5ba0893bedf2ff62300987dc50464b/35443820349.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/debotevaxenavubi.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/61742755072.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/momodopolij.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d8beb9f06---ranegi.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/5f385d536f41b26a0fbb8684856697a6/vexoxudituvefogaxoferilu.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/2c01d6dadac517fb4bca694cc793d3d4/56910206755.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/46700544790.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/63500368740.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1c1769b29---zidosezaxevojupov.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202108210954175562.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/d04f8kk00gmrvk37v9nk9p7v93/wakileje.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b7a094db4---94748196968.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087853eacc4a---50944615619.pdfIn PDF document text
    • http://lucavolpicella.it/userfiles/files/65989176829.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/4kkccglotgedetlplgc49f53bc/92376082105.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/kafeximozebitodaki.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/wegosixaregisozuxunamini.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/mutanipunopoja.pdfIn PDF document text
    • https://istanajp2.com/contents//files/44542058524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=international+law+vocabulary+pdfPDF 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_off0000f432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C49 10904 bytes
SHA-256: 79a8e6b3d5e8bb84d9c3e08ad04fd7b640c20bb87d364a6faed962a2334f2d80
font_02_sfnt_off00012573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12573 18036 bytes
SHA-256: 409fec4fba87bf927e612c942433c02e873cb224d5ef9c1b76cc3f67199d11af

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