Malicious PDF — malware analysis report

Static analysis result for SHA-256 3964e9a36d4d9a74…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 11:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0381668d2e9656bcb55886999505587a SHA-1: 4f5642c30dc60740e8c03f2fea18b3af7e9b3c6e SHA-256: 3964e9a36d4d9a7443e06ca764ef3c8dcef857c764be8ae4f61f01c5fb4f51bd
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or SEO manipulation scheme. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. While no scripts were extracted, the nature of the URLs suggests a potential for redirecting users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • 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://paramountswimwear.com/userfiles/files/zulediviwux.pdf In PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/503b0de90539a07e23ecc93ae8affa83/sulelapogugijunip.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/43955992305.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613335fa4c530---namuzegexaxowixuwat.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/fagisusunuveruwom.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/92286269028.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/wowesovomeraso.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/11454993034.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/4025601284.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/xowijakadaga.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/befete.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/latolexomuleluwali.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/gividasufixogebovem.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/73985350504.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/goxuxegoguxerodimu.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/rakef.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/fugitovo.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210901165828.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/54030686402.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/78872083643.pdfIn PDF document text
    • http://adice-area.com/pictures/files/31840386652.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/lezowutadarugifepopeze.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d53ca14f64---jenugetosutu.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/rilipozabikurikin.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/dp3i1md89kp7mugvhbdkcib1q4/guradivivevibuxusiwex.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/97804139108.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343b1b1a27b---83184284442.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/38278293184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=david+bowie+tour+dates+1973PDF 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_off0000d4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B5 10924 bytes
SHA-256: 934ced78f5d4496c678b7c535c45ceed975fdb6b72ba09c3782daf320dc4907f
font_01_sfnt_off0000ee5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 17740 bytes
SHA-256: b7153d13306899047ab36f9a174111a25c080e3c4fc23c4060d6ea8dc35abb7b

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