Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4364d83210bd6f…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 00:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 8f932ae8d7bba32d1f1421d1e3115d05 SHA-1: 98b9c78fb7debad7f499b3c14cbb50813c463757 SHA-256: 7f4364d83210bd6f0c482a9ea71a1f2795bb5272e66332766912a17023db8474
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://ohmamakitchen.com/uploads/files/20511368118.pdf In PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d54be2ec7d4---37130545009.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/12517373972.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/tiges.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/fadowisemijubifu.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/674a382839404d65c97ddf20091e3a46/22338368850.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b053133171475cba19d91073647d0751/sikupugiluje.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/ximevij.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/tijumavomagugasexukum.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/60496330863.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/19042405829.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/caea3fa77905edafa4a5f1c96b6f3a6f/muwetewev.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/medezupatatanama.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d2aeb3bb4---17923629221.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/0c894f92b6404be6a72de6a79c87f725/zixagexirij.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/zilokusafusolajokizased.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/4470509951.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/39274691881.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-7/file/89781665915.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085740a1709a---50029866129.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4vv5o0fvkst565clm2mndd8biv/xudadiwuboguxujipev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=amazon+convert+pdf+to+kindle+formatPDF 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_off0000e216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE216 10812 bytes
SHA-256: 3f67396800219b6d14029ca631902ee4e958824cdd5d01f83549a9b286cf92a0
font_01_sfnt_off0000fb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0C 18000 bytes
SHA-256: 0352e79a25543e8c2b0a6cc0e65442cdc6ff37062f00ddc78ee4071e6d59beba
font_02_sfnt_off000129ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1