Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1b0259af4bab3c…

MALICIOUS

PDF

79.8 KB Created: 2021-09-08 10:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0a3311aa612fa7fb9e9f42bc316a54e2 SHA-1: 7579f0ffef47fe11c04d28f852ed0debb4db1366 SHA-256: 7c1b0259af4bab3cb6b8836b7e9619dd841532096e71a557cb8a8908c6283ae9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. An embedded JavaScript stream was also detected, which could be used to facilitate the download or execution of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • 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://cementfeet.com/userfiles/file/wojediwaditalupolabikugi.pdf In PDF document text
    • http://jingluo.net/uploadfiles/files/10745869258.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/kixarelexej.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/13da5c0f66918c6b3403ab188e11a3ba/piguvokudexerube.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/7e5d96271f19c279d70a85361c864403/sogevivaduwesuzowugeb.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/077c41735fa837f55f1dae772053f451/putosanido.pdfIn PDF document text
    • http://canadanur.com/resimler/files/zevisedotuxob.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbbe6a2cd0---ledipunewibilowavonadori.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/jiborolewixirifitexezi.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/25054237545.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/da2b13a5d4eefb457e7148d667e96152/51623202585.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/tukuzasi.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b150632c---vosaworulegenavadazaxo.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962187b0f80---315200080.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/55678884769.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/7464ae62bfc8d7a0c57195d837cfc277/81735669601.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/68968809981.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608697aa3cb37---lowidejutakedowigo.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/gurajogegasuna.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/daxeb.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/loluwiwuxegoje.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/92d338a7d1859d443fde73234c11b7ac/laxomolidotagawajufozubap.pdfIn PDF document text
    • https://kham.vn/userfiles/file/kalonutuxoborukufavemekux.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/bizitenapikibitetoteze.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/sobilivazarojikinamiloj.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d376fd3fbe---13549770541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=jesus+at+the+center+piano+sheet+music+pdf+freePDF 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_off0000d4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E9 10932 bytes
SHA-256: b6d30c4cbe1dd2fcfd1a87e53a84e91f5f34dc6f347d615c29bdd6755d889473
font_01_sfnt_off0000ee0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0F 16688 bytes
SHA-256: 76dc85ea1f481b9c426ea982d56eeb71baef8728b54dee873ec6eb4b15729ffd
font_02_sfnt_off000118b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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