Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9a1ffa39f03a3e…

MALICIOUS

PDF

158.5 KB Created: 2021-07-05 05:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0252041f6fb4846b6b266753566a193a SHA-1: 97ec0e57af7dae54e73b7e8c153085a0116241dd SHA-256: ff9a1ffa39f03a3ee3c533ed88dd6121f10e38525c656acabe902457cec2d832
216 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malware. The heuristics indicate a lure to enable content and a password-protected archive handoff, which are common tactics for malware droppers to bypass security measures and deliver a second-stage payload. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

Heuristics 8

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973f29d2684---rosofitowadovadil.pdf In PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/47dc45cbee4c6c144ab9300c92f7f0f9/xisijiviguk.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/26764742479.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//5007116595.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/pazagefegefanupixidoruro.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfa2fbf8f4---folubefowepudewajoverogo.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/21599500516.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/75311134287.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99e3cf06f5---22789815985.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/21d051823ce7e8d9c55e5abfd36fe67c/radejejipunof.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c25095778df---18126721583.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/c4268cdad3fb569cc8b96357164216da/jukukoru.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/10831115052.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/fimola.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/80859723429.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/a85ff42df5e2f6949136577a8cdd637d/45898977161.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/18997855755.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/vudasaxegi.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/bawogibogeted.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/810a7d5557e2e0ed14484ce1a15f655a/xowurotefolilanuzodutizu.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608405e6c3fbb---4943639347.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5cb19d322---regufenosasodoverotidaw.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be45acaaf99---rotipuxewukalesolowunazas.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aaac4e813a1---91470661267.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=recover+excel+file+not+saved+office+365PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20AE2 17808 bytes
SHA-256: 0fcc47e5c08210e2377d7205af75d4a23844d39ae0dc1b20f7f0d9c91cc99a58
font_01_sfnt_off000239e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x239E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000251fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x251FB 11156 bytes
SHA-256: 6b1eba1777c8c0697d01bf71a70d83226aadb6ccbe1fcab09ce7308c3920a63c

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