Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c7f66ac58665f6…

MALICIOUS

PDF

91.6 KB Created: 2021-07-31 14:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4bf46245ec6eb1f79f20f3b9cbbc6880 SHA-1: beae4d91754731bcf79269d2e25ea153e02d2557 SHA-256: e8c7f66ac58665f6d39814b2f94cd3e654551f635886af58001a991dc2beec94
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of a 'Password-protected archive handoff' heuristic suggests a multi-stage attack where the user is instructed to download an archive, likely containing a malicious payload, after being lured through these links. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://viviapalermo.com/userfiles/files/47124034700.pdf In PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1380e388d3---rozaveserigarugif.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608861467441d---66428437827.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/d33ae98e2627c09878ac85ff238c41a8/rabip.pdfIn PDF document text
    • http://goref.ru/files/file/nikutiwofumaputagele.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/5858d9654b2ba04d931d7ba1e49cc97c/14473548029.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/79fb064bf20ef1e7f7c4fb44d514994e/29780216572.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/bvch0k0069ucn3cfl6t5g1ffio/kebovulavu.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/vibun.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/topizavekogobexu.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02ab772009---49665521166.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/mokotara.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a195905d4a9---17849959772.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/wosewogijuwapavedogon.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210717033101178.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/3324979921.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/jofovagepeja.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/nedemusisijofajiwusuvofu.pdfIn PDF document text
    • https://csn-alliance.com/data/files/wasojetirejigigejafomavak.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210621051947.pdfIn PDF document text
    • http://amdind.com/userfiles/file/72373414421.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608545752ef17---49069828789.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8f9a39f75---42314852102.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609da472548e3---vikole.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8235ca4fa---31353888172.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a08923cd75a---96213659628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=como+traduzir+um+arquivo+pdf+de+ingles+para+portugues+gratisPDF 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_off0000fbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAB 11244 bytes
SHA-256: 85175e656181bb8089b4b69b6567655d779f178a7e1902e6870db2b5d85c74a8
font_01_sfnt_off00011598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAA 19452 bytes
SHA-256: 5f07562ff5c14f54fd04b12d66195c97a40d96965f9a7a72e07c10d6e5e36ace

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