Malicious PDF — malware analysis report

Static analysis result for SHA-256 509390ce45b58b45…

MALICIOUS

PDF

74.5 KB Created: 2021-09-05 17:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e13ba08f4432a88004859c676afbd033 SHA-1: 3aa5471cb68ccf1324fc03ec0633b81ad1042885 SHA-256: 509390ce45b58b451ebe244e17f02bb5e7e22ff57d6c7f0a427ebe8622b6353a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://chcial.ru/uplcv?utm_term=magruder%27s+american+government+chapter+12+pdf PDF link annotation
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7ddd48de4---babalasokizudumawipinanur.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fb71b5dde---51055888285.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/78803440844.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/c13d75644c3b4662d43238a75ed20b51/wejikozawuvowubenevusifip.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/nofosazagez.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce83816243---luwazebupa.pdfIn PDF document text
    • https://12tiga.com/contents/files/kinixerunedururelemisusi.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e97721aa07---wurobefovadejenagenu.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/zufuxubozobo.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8659c34ad7---zekujanu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bebd037de44---31304478246.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cef4209da3e---xasawapavaguburubasuneta.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/kmea5bmeiq5nbl93sllm8foa3o/rikemukumakofokebijabu.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/fejesifedumavirox.pdfIn PDF document text
    • https://telenovella-bg.com/files/59841981396.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16109745c4652e---nokukusi.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210817_170251.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/wijulidu.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/zuben.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/nokab.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/lexuxapaluji.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/40045084429.pdfIn PDF document text
    • 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_off0000bd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7E 16892 bytes
SHA-256: 233c41e221042f4cf6babc2afa5f74bf63de921abfb39b4bf94f3bd767edb2b0
font_01_sfnt_off0000e974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE974 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001018b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018B 11384 bytes
SHA-256: d4bb6b5f52e36b548e6307625dcb7a746b5e02af787770320c678a8a91a8ffb1

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