Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3aa3931296a6da…

MALICIOUS

PDF

79.0 KB Created: 2021-08-16 01:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8f99286bc8f9f34072da7c90af085ee9 SHA-1: eda052d4ae25bedb2ee9cf193af4bdbd0bf1762f SHA-256: 5c3aa3931296a6daa243011d0f67065e53e165d082af7b9246fe054f37109220
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The file's structure and embedded URLs indicate an attempt to exploit users through deceptive content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6891

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://crysiq.ru/uplcv?utm_term=exercice+d%27%C3%A9criture+ce1+%C3%A0+imprimer+gratuit PDF link annotation
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f17c9a0b08---bisovudaxuxi.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcc106cb95---levojefubegugibeto.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160963ab647efc---satibi.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/dunawizelafa.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708645aaa82---kezen.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/6eh8hr9bp6c2gpdoebakerd2a9/velenojamobinutupozaso.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/nabezim.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/pozesusosugigofeva.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/17791434837.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/butudawotabaxek.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2efc3a397---ginogoxaxabizibabinib.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/86837766473.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/powufodewifogawed.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/15875707044.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/67325365599.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/xaloviguzagaveka.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/5736281057.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/15067122099.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210603_1CDBF62F856BC1A6.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f615180f46c---61308170876.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210803_4DCA5834F5DD7326.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16090e0eaa7674---pugilibijesazon.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/nodefuper.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/95989097603.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/vokugalomojasut.pdfIn 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_off0000d830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 11028 bytes
SHA-256: b3dfd3790753954c2236edd277cf303a181a891a1c802e17308c005e294e6b2f
font_01_sfnt_off0000f108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 18816 bytes
SHA-256: c051fd8024d50c1babe6197453ed117962ed6ad0e76bef98dac0127c034b55d6
font_02_sfnt_off00012036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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