Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cee3b9c6e44319c…

MALICIOUS

PDF

95.5 KB Created: 2021-09-03 15:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5855149b728a21ac4e64fe54f3571e11 SHA-1: 247973c5d50f347051a5e5cd4ceafdc6144b00b8 SHA-256: 8cee3b9c6e44319c3fbe18a611a25ffa153646ee8a751584dbf26b9adbda03ce
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document may also instruct users to open a password-protected archive, a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://infrive.ru/uplcv?utm_term=estructura+de+datos+python+pdf PDF link annotation
    • https://tomas-music.com/contents/files/72719615466.pdfIn PDF document text
    • http://grupophi.es/uploads/files/butosigufonokukatako.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095988029e7f---18467840434.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160faa771bdadb---26969881934.pdfIn PDF document text
    • http://montesantangelo.it/files/files/3450991760.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/47c1e47057a3dcdd1f57f429d642f4b1/nebodopa.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/512452221.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/83409435374.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/8592080823.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0aea0c914c---83988760117.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/c18b0122701f28801040acb3014b4137/wexofexerafuvu.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/67980634521.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/gumot.pdfIn PDF document text
    • http://fitviewer.biz/files/file/59389948734.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/vulusunamoso.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c52516c8dbc---66466043032.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/kejafufulixuzit.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/03dd5e8398440b2ba14398ef5687a307/divutusirelokesojivademu.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/zulopenugig.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/ef6eff6019a75ab8ac8563973cd3e81b/vetuwejuwopemoz.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/jimilo.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/6937567157.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_off00010a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8C 20296 bytes
SHA-256: e654fd6819141af68920d04539344fe56a7bd4dfd9814d27c1f8fb6f03e1036a
font_01_sfnt_off00013f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001578a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1578A 10776 bytes
SHA-256: 30d58040ffc85c862b4053f16b582aa9bb393125511b80798d746743c52988e2

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