Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d6a5aee237954e…

MALICIOUS

PDF

79.5 KB Created: 2021-09-03 18:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0a2ea33575c6e2fdb58160b16729240c SHA-1: 8aa04225045eae1e1a2bda66b94970f87ec79f12 SHA-256: 25d6a5aee237954e1e73d9daa0851e3cfd4d9016370c08a008a4522e9b1a79df
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that point to potentially compromised CMS upload directories or disposable hosting. The primary purpose appears to be directing users to external, untrusted resources, likely for malicious purposes such as credential harvesting or further malware delivery.

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 https://banghenails.com/upload/file/68182724782.pdf In PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730bc3d8351---57518997381.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/27709133141.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc678ef17a4---rawefut.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c62aa622830---vozuwuzajiterasede.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/17828477545.pdfIn PDF document text
    • http://adainst.com/uploade/files/20210626080134.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/v2te3v95qaulta7j2ekolpj3id/biduranumiwegasisoxera.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/48855739569.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/5180668673.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b09994231d---zemora.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/bg7u621f8n5r511v3lm61c8ksl/fipagawarudadozuwib.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/midedewemerenirerimiki.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58fb9aa9af---94444884353.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/r54a6qcfnitf7h1hrj5hso8le0/masakajiluladi.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c0c78e17d---80294980674.pdfIn PDF document text
    • http://strandedtattoo.com/file/13960314941.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/47125881826.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2a9696efb---daxuvesagiv.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/76240437400.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/sa6emft9otsnd1p7tec499otlu/56367299695.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/medevonukeruzujorabu.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210708105814_289412033.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/41819400833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=creatinine+test+kit+pdfPDF 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_off0000d343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5A 10448 bytes
SHA-256: 98b0c7c6e0cfc195c55e68eb06b11465603f99c3c163e995bc721d788482d102
font_02_sfnt_off0001032f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 17440 bytes
SHA-256: 4fac9fdcfbd274d0e00d20eb3a7f7e026340d4b9687049c04322a831bd158079