Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d6242dfa72e2ce…

MALICIOUS

PDF

76.5 KB Created: 2021-07-29 22:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a52f608201a2c9adad59aa4e00767eb7 SHA-1: 991d37f40a10744d9036902e7131fda641ff26bf SHA-256: e7d6242dfa72e2cecd060fdedc78234e419f3577f27956ffee267eb721176f47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to other PDF files hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d12b1b610c---jikujomixijunusidodul.pdf In PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609db590d17e2---nutagedesi.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/87012425539.pdfIn PDF document text
    • http://sigep60s-ncbeta.com/clients/44785/File/bufonetujonadewu.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/81144247772.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/kofazifobunozadanazujes.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/20109687992.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/3377419188.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/8e8f487a5714762066589226d7f899fc/80470232582.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4338801bd2---xegowosesewozajaz.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/12589908788.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fa252f092a2---pafofogobokimisipipabati.pdfIn PDF document text
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/tapexuvekifepu.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/getisit.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/wisuvupos.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8cd4d37b---51453228610.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160986866ab51b---sorujabifapiku.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/95225543905.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/wumuxokesovedo.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087ba446e6f4---95058438071.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/47376048799.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/90732631950.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af19cf19a20---devebakususamonibovara.pdfIn PDF document text
    • https://immobilgold.com/file/zalav.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16074ced8ccc65---lubulorukebubawosodilet.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/legof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ionic+naming+worksheet+%231+answer+keyPDF 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_off0000c687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC687 16592 bytes
SHA-256: 75fd92dd9bfc55e1380136a0742a141459f50db9c6ba45a08107197c17b61642
font_01_sfnt_off0000f19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 10760 bytes
SHA-256: f4c907a742708a13278e4bcd16a303a19353b1b7e753284f563a0fa9427f706a
font_02_sfnt_off00010a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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