Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe5881d0d07c0ae4…

MALICIOUS

PDF

110.0 KB Created: 2021-09-02 12:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 77d05c14021acd88a91ec0ba9b7ba530 SHA-1: d6ab312a4d3cafa55015c3d5dcfc8d11d5dfba02 SHA-256: fe5881d0d07c0ae4b0dcc19fb4490bc5a07468c15cade8afd213cc30acc9d06b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to other sites. ClamAV and ML classifiers identify it as a phishing or malicious trojan. The presence of compromised CMS upload links suggests these redirects likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://krisoc.ru/uplcv?utm_term=metabolismo+energetico+zanichelli+pdf PDF link annotation
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/f4585fbbb05351679a2a6a2bae4668d5/kujikiniwajudetivigilepu.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a55d2738b---demisobuja.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/89053597490.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160746f5b0676c---nadonorokoduje.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/gimoginuxizazasunazi.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/31239236810.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c15a4f4e7d8---51408676640.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd70c432da---58563260263.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/torewuzosupewu.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/zumatajetu.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/sofixugesofi.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bae8723259---puwolusejibuvilin.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/zanojepofekizubugamadaw.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/xixulus.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/37346145502.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/33618785164.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8d32b062c.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b28c550b22b---bexagunofanekodovuneti.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb04fbbcf7---kibogepufaxoketinuleg.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16099355386c83---87272023424.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66299bd198---tuvikig.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/dajuvuferoxudizefapip.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_off0001479f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1479F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FB1 18716 bytes
SHA-256: c66d3e01ca0f1149077b364cb8703358e4354e06e7c74b535e488f9b6fa50fb5
font_02_sfnt_off00019049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19049 11260 bytes
SHA-256: 8cd43a71f1ecc0146521fc65b991572f52983560d405b8a60c4c5bd34fe130ac

Open this report in the interactive analyzer, or submit your own file for analysis.