Malicious PDF — malware analysis report

Static analysis result for SHA-256 302d13ee8634ce65…

MALICIOUS

PDF

98.4 KB Created: 2021-09-08 10:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 91b50dee31377cca60ec940c805b064a SHA-1: 14db3f831e7ef858ef1c2160d075fda947ae86d7 SHA-256: 302d13ee8634ce65f013d801a0b9ac3f4ce52d8c011ae2b4425643c0606473c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of external URIs and the link farm structure strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • 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.
  • 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://engineersclasses4competition.com/files/others/98156258187.pdf In PDF document text
    • http://chinamakina.com/userfiles/file/dupipirorageripetis.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/30bcc24deb484c4be316c29eac223aa0/23201920541.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/fapiwezadiso.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b925b826449---nemeduxiz.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/76851138153.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/9199051640.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/11957482160.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/3gfg8m51phieg2fi823e9kjto1/21486745917.pdfIn PDF document text
    • http://masonfamilyreunion.org/clients/b/bd/bdaf0a3c19eb5f10f0519c747c117e37/File/sapimorupugaselix.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a40507218---47856292623.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/vfgkh4btsf971iklb81k5pcnn5/dodiredebaxanuta.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2319f3bb430775641f6b89f76d32295b/farumimugazamufepaz.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/4d2cdaf4ee2292e73c5efa8d87c69113/52343941794.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/13227386869.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/3420410413.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/26476318728.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/baxulobiwomanadadubix.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/lepukesawavevivosivikub.pdfIn PDF document text
    • http://gchsclassof1970reunion.com/clients/6/6a/6a45fbe13d63dbb0eb8070d7cb9dbc89/File/57306718615.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/kajerarugosabetebolekimoz.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610b45a0508ea---zesutodawogu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/pjj4b02karbe209ddojsl46pcp/22365177217.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d37b8c38714---nobujune.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/1242be1ae729e37675359274fb8ca5a7/rikulir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=covalent+compound+properties+worksheetPDF 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_off0001198f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198F 18792 bytes
SHA-256: 6e786c424a37b958f0179540a615854b84d83f246a48cbc55403f7c5f1ff9fa8
font_01_sfnt_off00014a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A41 11152 bytes
SHA-256: fc064c75ea06bd00cd65318e0cc5c93cba153516d113a034ca1c290c864b1942
font_02_sfnt_off00016433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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